Internal "bulletin board" content boxes for each committee

[ddabble]

Proposed changes

Added "bulletin board" content boxes for each committee on the internal site. These can e.g. contain notices, instructions, and links to common resources, and can act as a "hub" for each committee.

Also added a new navigation menu just below the title of the internal home page, which is used to navigate between the committee boards and the home page.

Areas to review closely

The new navigation menu is a little bit different from other things on the website, so it would be nice to get some feedback on whether it still fits or should be changed 🙂

Deployment notes

The dev-board content box should have the internal.can_change_rich_text_source permission, so that it's possible to change the rich text source code directly.

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 guide 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 #460 (86c421b) into dev (54bb962) will increase coverage by 0.01%. The diff coverage is 90.47%.

@@            Coverage Diff             @@
##              dev     #460      +/-   ##
==========================================
+ Coverage   88.04%   88.05%   +0.01%     
==========================================
  Files         134      134              
  Lines        5436     5449      +13     
==========================================
+ Hits         4786     4798      +12     
- Misses        650      651       +1     

Impacted Files	Coverage Δ
internal/templatetags/member.py	89.18% <88.88%> (-2.48%)	:arrow_down:
internal/urls.py	100.00% <100.00%> (ø)
internal/views.py	89.67% <100.00%> (+0.11%)	:arrow_up:
checkin/views.py	43.45% <0.00%> (-0.34%)	:arrow_down:
checkin/local_scanner.py	0.00% <0.00%> (ø)

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[ddabble]

Maybe rename "forside" to MAKE?

Ooh yeah, I agree, that would make it more clear 👌