Rename various things

[ddabble]

Proposed changes

Improvements

• Added a title to the quota admin panel, and switched out the "Add new quota" button for a green plus button, like other admin panel pages (057f2f9febde26f6e686f5c3cc3e422584517395)

Other changes

• Renamed lots of views (5f3e9d4db65c7a27949efdce24d82705ff3067a2), names of paths (84cc6b3e68e86fc265d53fe990b7c90015e56541), forms (3486ad861cbb6678b5da87ca24a03ed59a063b91) and templates (4f19eb4fb953ce9aa890f284b0f2c9bf9b0e45d2) to comply with the style guides
• Renamed IndexView to IndexPageView, and its path name from front_page to index_page (e8320f46ce3990ef4a1fcb70ca37c053c16527bb)
• Code cleanup (005035e2f46360f25879d36b142f7c036cdaf2cf)

Areas to review closely

References to the renamed code that I might have forgotten to update.

Checklist

(If any of the points are not relevant, mark them as checked)

• [x] Created tests that fail without the changes, if relevant/possible
• [x] Made sure that your code conforms to the code style guides and that any common code smells have been addressed
  • (It's not intended that you read through this whole document, but that you get yourself an overview over its contents, and that you keep it in mind while taking a second look at your code before opening a pull request)
• [x] Added sufficient documentation - e.g. as docstrings or in the README, if suitable
• [x] Added your changes to the "Unreleased" section of the changelog - mainly the changes that are of particular interest to users and/or developers, if any
• [x] Added a "Deployment notes" section above, if anything out of the ordinary should be done when deploying these changes to the server

[codecov[bot]]

Codecov Report

Merging #648 (5d12ebc) into dev (ce716e9) will increase coverage by 0.01%. The diff coverage is 91.66%.

@@            Coverage Diff             @@
##              dev     #648      +/-   ##
==========================================
+ Coverage   87.38%   87.39%   +0.01%     
==========================================
  Files         135      135              
  Lines        5714     5719       +5     
==========================================
+ Hits         4993     4998       +5     
  Misses        721      721              

Impacted Files	Coverage Δ
src/announcements/urls.py	100.00% <ø> (ø)
src/checkin/urls.py	100.00% <ø> (ø)
src/contentbox/models.py	78.78% <0.00%> (ø)
src/docs/urls.py	100.00% <ø> (ø)
src/faq/urls.py	100.00% <ø> (ø)
src/groups/urls.py	100.00% <ø> (ø)
src/mail/email.py	43.90% <ø> (ø)
src/make_queue/urls.py	100.00% <ø> (ø)
src/news/urls.py	100.00% <ø> (ø)
src/checkin/views.py	44.57% <57.89%> (ø)
... and 35 more

[ddabble]

Regarding the Code Climate status check, I set it up recently on their website, but it seems like it maybe needs some tweaking 🤔 Anyway, none of the issues it lists are actually caused by changes in this PR, as things have simply been renamed/moved, so I will ignore them for this PR.

[ddabble]

Merging without explicit approval from another member, as the Dev committee previously agreed to merge these changes and assume they're relatively bug-free, simply to get things done quicker.