♿ [#1078] frontend a11y issues

[jiromaykin]

multiple issues:

• background of success messages (fix errors where a comment breaks the HSL color codes)
• area of link too large around home-banner image

[codecov-commenter]

Codecov Report

Merging #468 (604013e) into develop (9e8c1bd) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #468   +/-   ##
========================================
  Coverage    96.46%   96.46%           
========================================
  Files          505      506    +1     
  Lines        18255    18263    +8     
========================================
+ Hits         17609    17617    +8     
  Misses         646      646           

Impacted Files	Coverage Δ
src/open_inwoner/accounts/forms.py	97.78% <0.00%> (ø)
...migrations/0033_alter_siteconfiguration_favicon.py	100.00% <0.00%> (ø)

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[vaszig]

• Success message works fine!
• I still see problems with the logo while trying different size images.

• Maybe we should target another class (ex. the image class) and not the parent one (logo).

[jiromaykin]

• I still see problems with the logo while trying different size images.

Thank you; i see now i need to completely rework the grid.