docs: redesign search + re-introduce ai assistant in v2 docs

[shahednasser]

• Redesign search + AI assistant
• Re-introduce AI assistant in v2 docs

Closes DOCS-823, DOCS-918

Preview: https://docs-v2-git-docs-redesign-search-medusajs.vercel.app/v2

(Note: the AI Assistant won't work in preview as it's configured to work on specific URLs)

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Latest commit: 5889949

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Name	Status	Preview	Comments	Updated (UTC)
api-reference	🔄 Building (Inspect)	Visit Preview	💬 Add feedback	Aug 21, 2024 8:19am
api-reference-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 21, 2024 8:19am
docs-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 21, 2024 8:19am
docs-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 21, 2024 8:19am
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[olivermrbl]

Nice