chore(lint): setup eslint-config-flat-gitignore

[9romise]

eslint-config-flat-gitignore automatically excludes files listed in .gitignore during linting, so we don’t need to specify them manually.

[changeset-bot]

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[FloEdelmann]

Good idea, this makes it more readable and less likely to diverge 🙂

[FloEdelmann]

Thanks!