docs: upgrade to Rspress V2 new UI

[SoonIter]

Summary

docs: upgrade to Rspress V2

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

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Lighthouse	1 paths audited Performance: 48 (🔴 down 20 from production) Accessibility: 100 (🟢 up 3 from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: 60 (no change from production) View the detailed breakdown and full score reports

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