Support no_footer option

[ghost]

#1305

but I wasn't able to test that, because looks like this guide https://remark42.com/docs/contributing/frontend/ is outdated.

[codecov]

Codecov Report

Base: 58.07% // Head: 57.95% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (4cbb22b) compared to base (53cc370).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1511      +/-   ##
==========================================
- Coverage   58.07%   57.95%   -0.12%     
==========================================
  Files         131      131              
  Lines        2910     2916       +6     
  Branches      743      745       +2     
==========================================
  Hits         1690     1690              
- Misses       1089     1094       +5     
- Partials      131      132       +1     

Impacted Files	Coverage Δ
...rontend/apps/remark42/app/components/root/root.tsx	0.00% <0.00%> (ø)

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