Add Apple auth provider frontend support

[paskal]

With distinct logos for light and dark theme from https://devimages-cdn.apple.com/design/resources/download/Logo-Sign-in-with-Apple.dmg

Logos should be adapted as now the logo is too small. However, everything seems to be working. Resolves #906.

[codecov]

Codecov Report

Base: 58.02% // Head: 62.35% // Increases project coverage by +4.32% 🎉

Coverage data is based on head (2785993) compared to base (067a8bc).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1560      +/-   ##
==========================================
+ Coverage   58.02%   62.35%   +4.32%     
==========================================
  Files         131      139       +8     
  Lines        2911     3421     +510     
  Branches      736      803      +67     
==========================================
+ Hits         1689     2133     +444     
+ Misses       1091     1090       -1     
- Partials      131      198      +67     

Impacted Files	Coverage Δ
frontend/apps/remark42/app/common/types.ts	100.00% <ø> (ø)
...k42/app/components/auth/components/oauth.consts.ts	100.00% <ø> (ø)
frontend/packages/api/clients/index.ts	96.42% <100.00%> (ø)
frontend/packages/api/lib/cookies.ts	63.63% <0.00%> (ø)
frontend/packages/api/index.ts	100.00% <0.00%> (ø)
frontend/packages/api/lib/fetcher.ts	80.85% <0.00%> (ø)
frontend/packages/api/consts.ts	63.63% <0.00%> (ø)
frontend/packages/api/clients/auth.ts	82.97% <0.00%> (ø)
frontend/packages/api/clients/public.ts	92.81% <0.00%> (ø)
... and 2 more

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[github-actions]

size-limit report 📦

Path	Size
public/embed.mjs	2.03 KB (0%)
public/remark.mjs	72.76 KB (+0.06% 🔺)
public/remark.css	8.12 KB (0%)
public/last-comments.mjs	35.67 KB (0%)
public/last-comments.css	3.72 KB (0%)
public/deleteme.mjs	12.05 KB (0%)
public/counter.mjs	749 B (0%)