chore: use eslint flat config

[Hoishin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.96610% with 13 lines in your changes missing coverage. Please review.

Project coverage is 71.51%. Comparing base (d3771a6) to head (31a709d).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/index.ts	0.00%	6 Missing ⚠️
src/commands/index.ts	0.00%	4 Missing ⚠️
src/commands/start.ts	0.00%	1 Missing and 1 partial ⚠️
src/bin/nodecg.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
- Coverage   71.84%   71.51%   -0.33%     
==========================================
  Files          12       12              
  Lines         689      825     +136     
  Branches      133      136       +3     
==========================================
+ Hits          495      590      +95     
- Misses        190      231      +41     
  Partials        4        4              

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