Bug🐛: Fix broken links

Describe the bug.

Run make linkcheck:
Running Sphinx v3.5.4
loading pickled environment... done
building [mo]: targets for 0 po files that are out of date
building [linkcheck]: targets for 64 source files that are out of date
updating environment: 0 added, 0 changed, 0 removed
looking for now-outdated files... none found
preparing documents... done
writing output... [100%] prerequisites/visual_studio                                                                                                                                       

(DeveloperWorkflow/reviewing: line   26) broken    ../DevelopmentSetup/git_and_github_guide.html#make-a-contribution - 
(contributing/after_contribute: line   52) broken    ../DeveloperWorkflow/reviewing.html - 
(contributing/before_contribute: line    6) broken    ../DevelopmentSetup/git_and_github_guide.html - 
(DeveloperWorkflow/reviewing: line   31) broken    ../contributing/code_contribution_best_practices.html#commit-message-guidelines - 
(contributing/after_contribute: line   19) broken    ../DeveloperWorkflow/bots_and_integrations.html - 
(DeveloperWorkflow/reviewing: line   57) broken    ../contributing/code_contribution_best_practices.html#code-style-conventions - 
(DeveloperWorkflow/reviewing: line   69) broken    ../contributing/code_contribution_best_practices.html#writing-documentation - 
(contributing/before_contribute: line   15) broken    ../join-moja-global.html - 
(DevelopmentSetup/docker_installation: line   16) broken    ../prerequisites/docker.html - 
(DevelopmentSetup/visual_studio_example: line   15) broken    ../prerequisites/visual_studio.html - 
(DevelopmentSetup/visual_studio_win_example: line   13) broken    ../prerequisites/cmake.html - 
(             faq: line  258) broken    DevelopmentSetup/docker_installation.html - 
(             faq: line  246) broken    DevelopmentSetup/git_and_github_guide.html - 
(DevelopmentSetup/windows_installation: line   18) broken    ../prerequisites/vcpkg.html - 
(DevelopmentSetup/docker_installation: line   29) broken    FLINT.example_installation.html - 
(contributing/before_contribute: line    8) broken    coc.html - 
(contributing/before_contribute: line    9) broken    code_contribution_best_practices.html - 
(join-moja-global: line   69) broken    contributing/ways_to_contribute.html#organize-moja-global-events-meetups - 
(DevelopmentSetup/docker_installation: line    9) broken    git_and_github_guide.html#make-a-contribution - 
(join-moja-global: line   14) broken    contributing/ways_to_contribute.html#answer-user-questions - 
(join-moja-global: line    9) broken    contributing/coc.html - 
(DevelopmentSetup/FLINT.example_installation: line   39) broken    git_and_github_guide.html - 
(DevelopmentSetup/git_and_github_guide: line   58) broken    docker_installation.html - 
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  552) ok        http://feeds.launchpad.net/pytz/announcements.atom
(env/lib/python3.8/site-packages/alabaster-0.7.12.dist-info/DESCRIPTION: line   11) redirect  http://alabaster.readthedocs.io - with Found to https://alabaster.readthedocs.io/en/latest/
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  521) redirect  http://cldr.unicode.org - permanently to https://cldr.unicode.org/
(contributing/code_contribution_best_practices: line   83) redirect  http://clang.llvm.org/extra/clang-tidy/ - with Found to https://clang.llvm.org/extra/clang-tidy/
(env/lib/python3.8/site-packages/alabaster-0.7.12.dist-info/DESCRIPTION: line   11) redirect  http://fabfile.org - permanently to https://www.fabfile.org/
(env/lib/python3.8/site-packages/alabaster-0.7.12.dist-info/DESCRIPTION: line    4) redirect  http://sphinx-doc.org - with Found to https://www.sphinx-doc.org/en/master/
(env/lib/python3.8/site-packages/alabaster-0.7.12.dist-info/DESCRIPTION: line   11) redirect  http://pyinvoke.org - permanently to https://www.pyinvoke.org/
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  587) broken    http://www.twinsun.com/tz/tz-link.htm - 404 Client Error: Not Found for url: http://www.twinsun.com/tz/tz-link.htm
(DeveloperWorkflow/bots_and_integrations: line   49) ok        https://allcontributors.org/docs/en/bot/configuration
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  577) ok        http://www.iana.org/time-zones
(env/lib/python3.8/site-packages/alabaster-0.7.12.dist-info/DESCRIPTION: line   11) redirect  http://paramiko.org - permanently to https://www.paramiko.org/
(contributing/after_contribute: line   16) ok        https://allcontributors.org/docs/en/emoji-key
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  561) ok        https://bugs.launchpad.net/pytz
(             faq: line   14) redirect  http://www.zdnet.com/article/coverity-finds-open-source-software-quality-better-than-proprietary-code/ - permanently to https://www.zdnet.com/article/coverity-finds-open-source-software-quality-better-than-proprietary-code/
(prerequisites/cmake: line   10) ok        https://cmake.org/download/
(join-moja-global: line   63) ok        https://community.moja.global/
(DeveloperWorkflow/automated_checks: line   90) ok        https://codeclimate.com/
(prerequisites/docker: line    6) ok        https://docs.docker.com/engine/install/
(prerequisites/docker: line   13) ok        https://docs.docker.com/engine/install/centos/
(prerequisites/docker: line   23) ok        https://docs.docker.com/engine/install/debian/
(prerequisites/docker: line   18) ok        https://docs.docker.com/engine/install/fedora/
(prerequisites/docker: line   28) ok        https://docs.docker.com/engine/install/ubuntu/
(join-moja-global: line   33) ok        https://developers.google.com/season-of-docs
(contributing/code_contribution_best_practices: line   41) ok        https://developercertificate.org/
(join-moja-global: line   33) redirect  https://developers.google.com/open-source/gsoc/ - with Found to https://summerofcode.withgoogle.com/
(DevelopmentSetup/index: line   56) ok        https://docs.google.com/document/d/139-1Nc5AR0yhN--Jb0W_jIfzUasoItkt4dyYM3m19N4/edit?usp=sharing
(             faq: line   51) ok        https://docs.google.com/document/d/15KY1CkCxRzB9ZBp68OLc2eWYuC5W-rqCKnTLaIG4tbg/edit?usp=sharing
(DeveloperWorkflow/automated_checks: line   19) redirect  https://codecov.io/ - permanently to https://about.codecov.io/
(DevelopmentSetup/index: line   58) ok        https://docs.google.com/document/d/185DrAQ9Tpg0XqwMt26ouzIDRKihJU0MZ2VUYX0L5Bys/edit?usp=sharing
(             faq: line   31) ok        https://docs.google.com/document/d/1Q2aVTzWchXQwupbEN7s37xANkPZvrLdfaFyYOT_8Diw/edit?usp=sharing
(contributing/code_contribution_best_practices: line  197) ok        https://docs.google.com/document/d/1feo9G91bbjth9RZ4606Rag4tAdRxuYpfnlWecs-gbbY/edit?usp=sharing
(DevelopmentSetup/index: line   54) ok        https://docs.google.com/document/d/1i6S0X0nTyxfJwn6KhGo9AahXOH1gBnTdwYdAxGchHsI/edit?usp=sharing
(DevelopmentSetup/index: line   55) ok        https://docs.google.com/document/d/1jceIX1E7HOmzmLW6C-E6GDbMz9sxM-nIy90CbY463Lw/edit?usp=sharing
(             faq: line  367) ok        https://docs.moja.global/projects/flint-reporting/en/latest/index.html
(             faq: line  345) ok        https://docs.moja.global/projects/flint-ui/en/latest/index.html
(prerequisites/git: line    6) ok        https://docs.moja.global/en/latest/prerequisites/cmake.html
(             faq: line  273) ok        https://docs.moja.global/en/latest/prerequisites/visual_studio.html#for-visual-studio-2019
(prerequisites/git: line   18) ok        https://docs.moja.global/en/latest/contributing/index.html
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  434) ok        https://en.wikipedia.org/wiki/Coordinated_Universal_Time
(GCBMDevelopmentSetup/windows_installation: line   21) ok        https://docs.moja.global/en/master/GCBMDevelopmentSetup/prerequisites.html
(DocumentationStyleGuide/index: line   43) ok        https://en.wikipedia.org/wiki/Markdown#GitHub_Flavored_Markdown
(prerequisites/git: line   12) ok        https://git-scm.com/book/en/v2/Getting-Started-Installing-Git
(DeveloperWorkflow/bots_and_integrations: line  215) ok        https://github.com/actions-ecosystem/action-create-comment
(DeveloperWorkflow/bots_and_integrations: line  244) ok        https://github.com/actions/first-interaction
(             faq: line  124) ok        https://flintpro.com/
(prerequisites/git: line   12) ok        https://git-scm.com/book/en/v2/Getting-Started-First-Time-Git-Setup
(join-moja-global: line   97) redirect  https://forms.gle/ibH2XsaBSAeiyQcX7 - with Found to https://docs.google.com/forms/d/e/1FAIpQLSf_T7WEFPkxrnt3hFwJU6xfFijsqRrI0hp7FH12h-AiNWz_Fg/viewform?usp=send_form
(DeveloperWorkflow/bots_and_integrations: line   16) ok        https://github.com/all-contributors/all-contributors
(DeveloperWorkflow/bots_and_integrations: line  270) ok        https://github.com/andymckay/labeler
(DeveloperWorkflow/bots_and_integrations: line  278) broken    https://github.com/andymckay/labeler#complete-basic-usage - Anchor 'complete-basic-usage' not found
(DocumentationStyleGuide/style-tone: line   74) ok        https://github.com/andreasvc/readability/
(DeveloperWorkflow/bots_and_integrations: line   16) redirect  https://github.com/apps/allcontributors/installations/new - with Found to https://github.com/login?integration=allcontributors&return_to=%2Fapps%2Fallcontributors%2Finstallations%2Fnew
(DeveloperWorkflow/bots_and_integrations: line   63) redirect  https://github.com/apps/prosebot/installations/new - with Found to https://github.com/login?integration=prosebot&return_to=%2Fapps%2Fprosebot%2Finstallations%2Fnew
(DeveloperWorkflow/bots_and_integrations: line  141) ok        https://github.com/apps/stale
(DeveloperWorkflow/bots_and_integrations: line  122) redirect  https://github.com/apps/stale/installations/new - with Found to https://github.com/login?integration=stale&return_to=%2Fapps%2Fstale%2Finstallations%2Fnew
(DeveloperWorkflow/bots_and_integrations: line   99) ok        https://github.com/btford/write-good
(DeveloperWorkflow/bots_and_integrations: line  101) ok        https://github.com/atom/node-spellchecker
(DeveloperWorkflow/bots_and_integrations: line   75) broken    https://github.com/btford/write-good#checks - Anchor 'checks' not found
(DeveloperWorkflow/automated_checks: line   19) ok        https://github.com/features/actions
(prerequisites/git: line   16) ok        https://github.com/join
(DeveloperWorkflow/bots_and_integrations: line  100) ok        https://github.com/get-alex/alex
(DeveloperWorkflow/repository_maintenance: line   21) ok        https://github.com/moja-global
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   71) ok        https://github.com/lukasa
(             faq: line   65) redirect  https://github.com/moja-global/About-moja-global/wiki/moja-global-is-controlled-through-open-governance - permanently to https://github.com/moja-global/About_moja_global/wiki/moja-global-is-controlled-through-open-governance
(join-moja-global: line   60) ok        https://github.com/moja-global/
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   70) ok        https://github.com/haikuginger
(contributing/ways_to_contribute: line   57) redirect  https://github.com/moja-global/About_moja_global/issues/new/ - with Found to https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fmoja-global%2FAbout_moja_global%2Fissues%2Fnew
(DevelopmentSetup/git_and_github_guide: line   20) ok        https://github.com/moja-global/FLINT
(DevelopmentSetup/FLINT.example_installation: line   30) ok        https://github.com/moja-global/FLINT.Example
(DeveloperWorkflow/automated_checks: line   11) ok        https://github.com/moja-global/FLINT.Data_Preprocessing
(             faq: line  398) ok        https://github.com/moja-global/GCBM.Visualisation_Tool
(DevelopmentSetup/visual_studio_win_example: line  308) redirect  https://github.com/moja-global/FLINT.chapman_richards - permanently to https://github.com/moja-global/FLINT.Module.Chapman_Richards
(DeveloperWorkflow/repository_maintenance: line   13) ok        https://github.com/moja-global/Import-Me
(DevelopmentSetup/index: line   26) ok        https://github.com/moja-global/Land_Sector_Datasets
(contributing/code_contribution_best_practices: line  163) ok        https://github.com/moja-global/moja_global_docs
(prerequisites/vcpkg: line   16) ok        https://github.com/moja-global/vcpkg
(DeveloperWorkflow/bots_and_integrations: line  215) ok        https://github.com/mschilde/auto-label-merge-conflicts
(DeveloperWorkflow/bots_and_integrations: line  122) ok        https://github.com/probot/probot
(DeveloperWorkflow/bots_and_integrations: line  122) ok        https://github.com/probot/stale
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   68) ok        https://github.com/pquentin
(DeveloperWorkflow/bots_and_integrations: line   63) ok        https://github.com/prosebot/prosebot
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  550) ok        https://github.com/stub42/pytz
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   73) ok        https://github.com/shazow
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   36) ok        https://github.com/urllib3/urllib3
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   69) ok        https://github.com/theacodes
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   72) ok        https://github.com/sigmavirus24
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line  221) ok        https://github.com/urllib3/urllib3/issues/1850
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   67) ok        https://github.com/sethmlarson
(DevelopmentSetup/git_and_github_guide: line   69) ok        https://github.com/zulip/zulipbot/
(contributing/code_contribution_best_practices: line   76) ok        https://google.github.io/styleguide/cppguide.html
(DocumentationStyleGuide/index: line   43) ok        https://hackmd.io/
(           index: line   34) redirect  https://join.slack.com/t/mojaglobal/shared_invite/zt-o6ta1ug0-rVLjAo460~d7JbZ~HpFFtw - with Found to https://mojaglobal.slack.com/join/shared_invite/zt-o6ta1ug0-rVLjAo460~d7JbZ~HpFFtw
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  552) ok        https://launchpad.net/pytz
(contributing/after_contribute: line   31) redirect  https://help.github.com/en/github/managing-your-work-on-github/creating-an-issue - permanently to https://docs.github.com/en/issues/tracking-your-work-with-issues/creating-an-issue
(DocumentationStyleGuide/index: line   43) ok        https://mdxjs.com/
(DevelopmentSetup/docker_installation: line   35) ok        https://hub.docker.com/r/mojaglobal/flint
(contributing/before_contribute: line   25) ok        https://moja-global.vercel.app/
(DevelopmentSetup/git_and_github_guide: line   77) ok        https://mojaglobal.slack.com
(DevelopmentSetup/visual_studio_example: line   16) ok        https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers
(             faq: line  290) ok        https://mojaglobal.slack.com/
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  521) ok        https://pypi.org/project/l18n/
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   32) redirect  https://pip.pypa.io - with Found to https://pip.pypa.io/en/stable/
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  542) ok        https://pypi.org/project/pytz/
(DevelopmentSetup/git_and_github_guide: line   14) ok        https://support.atlassian.com/bitbucket-cloud/docs/install-and-set-up-git/
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   88) ok        https://nedbatchelder.com/pix/Tidelift_Logos_RGB_Tidelift_Shorthand_On-White_small.png
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line  567) ok        https://tidelift.com/security
(join-moja-global: line   62) ok        https://twitter.com/mojaglobal?lang=en
(env/lib/python3.8/site-packages/pytz-2021.1.dist-info/DESCRIPTION: line   53) ok        https://tidelift.com/subscription/pkg/pypi-pytz?utm_source=pypi-pytz&utm_medium=referral&utm_campaign=enterprise&utm_term=repo
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   96) ok        https://tidelift.com/subscription/pkg/pypi-urllib3?utm_source=pypi-urllib3&utm_medium=referral&utm_campaign=readme
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   45) redirect  https://urllib3.readthedocs.io - with Found to https://urllib3.readthedocs.io/en/stable/
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line 1275) redirect  https://urllib3.readthedocs.io/ - with Found to https://urllib3.readthedocs.io/en/stable/
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   51) ok        https://urllib3.readthedocs.io/en/latest/contributing.html
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line  894) redirect  https://urllib3.readthedocs.io/en/latest/security.html - with Found to https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line  142) ok        https://urllib3.readthedocs.io/en/latest/v2-roadmap.html
(prerequisites/visual_studio: line   16) ok        https://visualstudio.microsoft.com/downloads/
(prerequisites/visual_studio: line   57) ok        https://visualstudio.microsoft.com/vs/older-downloads/
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line  739) broken    https://urllib3.readthedocs.io/en/latest/contrib.html#google-app-engine - 404 Client Error: Not Found for url: https://urllib3.readthedocs.io/en/latest/contrib.html
(contributing/code_contribution_best_practices: line  122) redirect  https://medium.com/@andrewgoldis/how-to-document-source-code-responsibly-2b2f303aa525 - permanently to https://agoldis.medium.com/how-to-document-source-code-responsibly-2b2f303aa525
(env/lib/python3.8/site-packages/urllib3-1.26.4.dist-info/DESCRIPTION: line   81) ok        https://urllib3.readthedocs.io/en/latest/sponsors.html
(contributing/coc: line   93) redirect  https://www.contributor-covenant.org/version/1/4/code-of-conduct.html - permanently to https://www.contributor-covenant.org/version/1/4/code-of-conduct/
(contributing/coc: line   97) ok        https://www.contributor-covenant.org/faq
(DocumentationStyleGuide/index: line   43) ok        https://www.google.com/docs/about/
(join-moja-global: line   33) broken    https://people.communitybridge.org/#projects - Anchor 'projects' not found
(join-moja-global: line   64) ok        https://www.google.com/url?q=https://join.slack.com/t/mojaglobal/shared_invite
(             faq: line   44) ok        https://www.mozilla.org/en-US/MPL/2.0/
(DocumentationStyleGuide/accessibility: line   83) ok        https://www.npmjs.com/package/broken-link-checker
(join-moja-global: line    9) ok        https://www.google.com/url?q=https://join.slack.com/t/mojaglobal/shared_invite/zt-o6ta1ug0-rVLjAo460~d7JbZ~HpFFtw&sa=D&source=editors&ust=1633078795555000&usg=AFQjCNFbieFLALt9IFd9pqxYz1S54wj-Rg
(join-moja-global: line   61) ok        https://www.linkedin.com/company/moja-global
(contributing/ways_to_contribute: line   93) broken    index.html#get-credit-for-your-contribution - 
(DeveloperWorkflow/reviewing: line   98) broken    manual_testing_pr.html - 
(contributing/after_contribute: line   59) broken    ways_to_contribute.html#answer-user-questions - 
(contributing/after_contribute: line   69) broken    ways_to_contribute.html#coach-or-train-new-contributors - 
(DevelopmentSetup/git_and_github_guide: line   58) broken    windows_installation.html - 
(contributing/code_contribution_best_practices: line   97) ok        https://www.python.org/dev/peps/pep-0008/
(contributing/code_contribution_best_practices: line  100) ok        https://www.pylint.org/
(join-moja-global: line   33) ok        https://www.outreachy.org/
(DocumentationStyleGuide/index: line   43) ok        https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html
build finished with problems.
make: *** [linkcheck] Error 1
Describe the steps to reproduce the behavior.

No response
Expected behavior.

Fix all the broken links (doing in batches is fine).
Add a CI action to check for broken links on every push, PR and a cron job.
Add relevant docs for users to check out broken links during development process.
Screenshots.

No response
Operating Environment

macOS, Python 3.8, Sphinx v3.5.4
Additional context.

No response
moja-global / moja_global_docs

Bug🐛: Fix broken links #151

Describe the bug.

Describe the steps to reproduce the behavior.

Expected behavior.

Screenshots.

Operating Environment

Additional context.
