Fix: READMEの開発サーバー起動コマンドを修正

[halsk]

Summary

• READMEに記載の npm run dev を npm start に修正
• package.jsonには dev スクリプトが存在しないため

Test plan

• READMEの記載が正しいことを確認
• npm start で開発サーバーが起動することを確認

Fixes #1

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