General code cleanup

[Kwasow]

Mostly use await in favor of then() in requests, as it improves readability. I also fixed lint-staged, which was not linting files correctly.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.14 ⚠️

Comparison is base (b202fb9) 89.54% compared to head (e64e16a) 89.40%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   89.54%   89.40%   -0.14%     
==========================================
  Files           8        8              
  Lines         306      302       -4     
  Branches       29       27       -2     
==========================================
- Hits          274      270       -4     
  Misses         32       32              

Impacted Files	Coverage Δ
src/routes/createGame.ts	88.88% <ø> (ø)
src/routes/startGame.ts	98.11% <ø> (ø)
src/routes/joinGame.ts	91.66% <100.00%> (-0.65%)	⬇️

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