feat: implement PWA

[incognitojam]

closes #59

TODOs

• manifest
• splash screen (do we still need to generate these?)
• cache fonts
• service worker
  • install SW
  • prompt for update, better than interrupting user maybe autoupdate is fine?
• offline experience
  • still loads when offline
  • indicate that the device is offline
• test on ios
• test on android

[github-actions]

Changes:

path	lines	diff
./pages/offline.tsx	21	+21
./pwa.ts	19	+19
./App.tsx	30	+12
./index.tsx	15	+1

Total lines: 4246 (+53)

[github-actions]

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Mobile

Desktop

[incognitojam]

seems to be an issue signing in, at least on iOS - see #253

[incognitojam]

[incognitojam]

Happens on iOS on this PR (same behaviour in safari and firefox, both use same engine on iOS?)