add: countdown until the 2021 qualifications

[Max1Truc]

This adds a countdown until 2021-10-15 16:42:00 GMT+2 on the homepage.

Some features it still misses:

• [x] allow some kind of setting to disable the countdown template

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@ef51fc4). Click here to learn what that means. The diff coverage is 37.50%.

:exclamation: Current head 1e89358 differs from pull request most recent head ac21900. Consider uploading reports for the commit ac21900 to get more accurate results

@@            Coverage Diff            @@
##             master     #355   +/-   ##
=========================================
  Coverage          ?   51.53%           
=========================================
  Files             ?      202           
  Lines             ?     9652           
  Branches          ?        0           
=========================================
  Hits              ?     4974           
  Misses            ?     4678           
  Partials          ?        0           

Impacted Files	Coverage Δ
prologin/homepage/views.py	26.92% <16.66%> (ø)
prologin/prologin/settings/common.py	97.88% <100.00%> (ø)

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[alarsyo]

Could you add a screenshot of what this looks like? :slightly_smiling_face:

[Max1Truc]

Sure, here is a screenshot:

[Max1Truc]

The jumbotron is already pretty weird on mobile devices, but yeah I'll have a look at it too.

[Max1Truc]

I have two options on mobile, either the countdown is still on one line and four columns (but takes up a lot of the screen) or it is in two lines and two columns (see screenshots)

[alarsyo]

Second screenshot looks good

[Max1Truc]

Ok, I'm going for it then.