settings: updated styling + linting

[thelostone-mc]

Description

• fonts now use Muli
• removed + refactored + reindented html
• optimized view for mobile

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

• css + html

Fixes

• Fix Settings Responsive View #1261

@SaptakS should I change them to rem ? :P

[codecov]

Codecov Report

Merging #1266 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1266      +/-   ##
==========================================
- Coverage   31.37%   31.33%   -0.04%     
==========================================
  Files         120      120              
  Lines        8320     8320              
  Branches     1083     1083              
==========================================
- Hits         2610     2607       -3     
- Misses       5601     5604       +3     
  Partials      109      109

Impacted Files	Coverage Δ
app/app/settings.py	83.61% <0%> (-1.7%)	⬇️

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[mbeacom]

lgtm