Chore(repo): Remove duplicated Prettier config

[literat]

Description

• prefer ESM code over CJS, so async import in CJS ESLint must be used

Additional context

Issue reference

[coveralls]

coverage: 78.696%. remained the same
when pulling 3bd81a6 on style/duplicated-prettier
into e5c8a7b on main.

[netlify]

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[netlify]

✅ Deploy Preview for spirit-design-system ready!

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Lighthouse	1 paths audited Performance: 96 (🟢 up 1 from production) Accessibility: 93 (no change from production) Best Practices: 100 (no change from production) SEO: 82 (no change from production) PWA: - View the detailed breakdown and full score reports

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