General code cleanup

[blackjackkent]

Description

• Removes now-outdated references to contact form behavior
• Cleans up theme styling bugs
• Fixes a prop-type issue and missing code coverage
• Re-adds Patreon button to front page

[codecov[bot]]

Codecov Report

Merging #152 (128534f) into development (4561ee3) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@               Coverage Diff                @@
##           development      #152      +/-   ##
================================================
+ Coverage        99.96%   100.00%   +0.03%     
================================================
  Files              287       285       -2     
  Lines             3205      3178      -27     
  Branches           588       584       -4     
================================================
- Hits              3204      3178      -26     
+ Misses               1         0       -1     

Impacted Files	Coverage Δ
...isplay/shared/header/components/HeaderLogoBlock.js	100.00% <ø> (ø)
.../display/shared/modals/GenericConfirmationModal.js	100.00% <ø> (ø)
...d/components/tracker-support/TrackerSupportCard.js	100.00% <ø> (ø)
src/display/views/help/components/ContactPane.js	100.00% <ø> (ø)
src/infrastructure/reducers/loading.js	100.00% <ø> (ø)
src/infrastructure/sagas/toastrSaga.js	100.00% <ø> (ø)
...astructure/selectors/ui/getIsLoadingIconVisible.js	100.00% <ø> (ø)
src/display/views/help/Help.js	100.00% <100.00%> (ø)
.../display/views/threads/components/CheckboxTable.js	100.00% <0.00%> (+1.81%)	:arrow_up:

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