Dynamic apply button

[ddabble]

Proposed changes

New features

• Added the django-constance package (74f3727de0ca41d90223888d75c5131c98c2c333)
• Added a dynamic setting for hiding/showing the apply ("Søk verv") button in the header (6450db6c5fa067c1bbc0281807e9ecadd5d2d296)

This is partly related to #523 and to the earlier discussion mentioned in #503

Areas to review closely

None in particular.

Deployment notes

Should run python manage.py migrate database.

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 #570 (806de24) into dev (aec1a29) will increase coverage by 0.74%. The diff coverage is n/a.

:exclamation: Current head 806de24 differs from pull request most recent head 4808981. Consider uploading reports for the commit 4808981 to get more accurate results

@@            Coverage Diff             @@
##              dev     #570      +/-   ##
==========================================
+ Coverage   87.71%   88.46%   +0.74%     
==========================================
  Files         134      132       -2     
  Lines        5585     5514      -71     
==========================================
- Hits         4899     4878      -21     
+ Misses        686      636      -50     

Impacted Files	Coverage Δ
checkin/models.py	91.07% <0.00%> (-1.53%)	:arrow_down:
util/url_utils.py	91.30% <0.00%> (-1.29%)	:arrow_down:
internal/forms.py	86.91% <0.00%> (-0.25%)	:arrow_down:
web/widgets.py	95.07% <0.00%> (-0.11%)	:arrow_down:
make_queue/views/api/calendar.py	97.61% <0.00%> (-0.06%)	:arrow_down:
util/view_utils.py	96.73% <0.00%> (-0.04%)	:arrow_down:
util/templatetags/datetime_tags.py	98.36% <0.00%> (-0.03%)	:arrow_down:
news/views.py	90.44% <0.00%> (-0.03%)	:arrow_down:
make_queue/models/reservation.py	94.71% <0.00%> (-0.02%)	:arrow_down:
docs/urls.py	100.00% <0.00%> (ø)
... and 22 more

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