Make sidebar filter sections collapseable

[FinalDoom]

Makes sidebar filter sections collapseable by clicking the title. Since filter lists can get quite long, scrolling down to the tracker list or whichever can be tedious. Simple chevron/carat indicator hides filter section children.

• Breaking change (changes that break backward compatibility of public API or CLI - semver MAJOR)
• New feature (non-breaking change which adds functionality - semver MINOR)
• Bug fix (non-breaking change which fixes an issue - semver PATCH)

[codecov]

Codecov Report

Merging #519 (c814d7e) into master (ce4b523) will increase coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #519      +/-   ##
==========================================
+ Coverage   71.96%   72.07%   +0.10%     
==========================================
  Files          61       61              
  Lines       11227    11227              
  Branches      712      716       +4     
==========================================
+ Hits         8080     8092      +12     
+ Misses       3147     3135      -12     

Impacted Files	Coverage Δ
server/services/notificationService.ts	52.75% <0.00%> (-1.58%)	⬇️
server/models/Users.ts	97.04% <0.00%> (+0.98%)	⬆️
server/util/feedUtil.ts	46.06% <0.00%> (+13.48%)	⬆️

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[mouzzampk2014]

If its possible instead of collapsing all, UI wise might be idea that after 10 or 15 trackers there will be a more at the end.

[FinalDoom]

Probably doable simply enough @mouzzampk2014 . I'll keep it in mind when I feel like working on stuff again.