Optimised easter animation

[klem-bot-delta]

• Switched beerflakes from GIFs to CSS animations
• Removed redundant JS code by using a ternary
• Switched cursed beerflakes to using a modifier CSS class instead of a dedicated function
• Moved some CSS styles from JS to the CS

[codecov-commenter]

Codecov Report

Merging #305 (ebe19d4) into next (46d63d6) will increase coverage by 28.54%.
The diff coverage is n/a.

❗ Current head ebe19d4 differs from pull request most recent head cc88b31. Consider uploading reports for the commit cc88b31 to get more accurate results

@@             Coverage Diff             @@
##             next     #305       +/-   ##
===========================================
+ Coverage   53.90%   82.44%   +28.54%     
===========================================
  Files          33       31        -2     
  Lines        4508     2518     -1990     
  Branches      265      182       -83     
===========================================
- Hits         2430     2076      -354     
+ Misses       2028      412     -1616     
+ Partials       50       30       -20     

see 33 files with indirect coverage changes

[atjn]

I am working on some more optimizations to the CSS and JS for the entire frontend. Some of my optimizations are almost identical to the ones in this PR. Is it possible to get this merged, or alternatively, have your blessing to duplicate these changes in my PR?

[Nielswps]

Could be nice to have the optimizations merged before easter 🐣

[JakobTopholt]

lgtm

[JakobTopholt]

Still lgtm

[Nobogo]

Looks good.

[krestenlaust]

Looks good to me. My only comment is some of the image files possibly aren't being used.

[krestenlaust]

Merged before easter 👍

EDIT: Reverted in favor of #329