Create settings page

[acelaya]

Closes #26

Add a new /settings route where users can edit their application settings as long as they are logged in.

The route renders a ShlinkWebSettings instance from @shlinkio/shlink-web-component/settings.

This PR also adds the logic to apply selected theme to the markup.

[codecov]

Codecov Report

Attention: Patch coverage is 61.36364% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 71.34%. Comparing base (00f2b30) to head (e275876).
Report is 1 commits behind head on main.

Files	Patch %	Lines
app/routes/settings.$.tsx	60.00%	19 Missing and 3 partials ⚠️
app/root.tsx	0.00%	9 Missing ⚠️
app/settings/SettingsService.server.ts	81.81%	0 Missing and 2 partials ⚠️
app/routes/server.$serverId.$.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
- Coverage   71.70%   71.34%   -0.37%     
==========================================
  Files          25       26       +1     
  Lines         933     1012      +79     
  Branches      103      113      +10     
==========================================
+ Hits          669      722      +53     
- Misses        161      177      +16     
- Partials      103      113      +10     

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