Cleanup and Github warnings fix

[Kwasow]

• Moved some files to utils/
• Changed how rate limiter is handled, so Github is happy

[codecov]

Codecov Report

Patch coverage: 88.88% and project coverage change: +2.55 🎉

Comparison is base (aa3994a) 77.27% compared to head (320b159) 79.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   77.27%   79.83%   +2.55%     
==========================================
  Files           6        4       -2     
  Lines         154      119      -35     
  Branches       17       13       -4     
==========================================
- Hits          119       95      -24     
+ Misses         35       24      -11     

Impacted Files	Coverage Δ
src/index.ts	0.00% <0.00%> (ø)
src/app.ts	94.73% <100.00%> (-0.51%)	⬇️
src/routes/createGame.ts	88.88% <100.00%> (+0.31%)	⬆️
src/routes/joinGame.ts	81.81% <100.00%> (+0.33%)	⬆️

... and 2 files with indirect coverage changes

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