ESLint のルール修正

[nanasess]

• ESLint を Prettier に依存しないよう修正
  • Prettier は柔軟なルール設定ができないため削除
  • Playwright 公式でも ESLint しか使ってない
• yarn.lock との併用は非推奨なので package-lock.json を削除
• Apply eslint --fix
• Apply yarn webpack

[codecov-commenter]

Codecov Report

Merging #517 (e0c009e) into master (1b23522) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #517   +/-   ##
=======================================
  Coverage   54.40%   54.40%           
=======================================
  Files          76       76           
  Lines        9039     9039           
=======================================
  Hits         4918     4918           
  Misses       4121     4121           

Flag	Coverage Δ
tests	54.40% <ø> (ø)

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[chihiro-adachi]

@nanasess
ありがとうございます、マージしました。