AI bot improvements

[pwizla]

This PR improves the Kapa-powered AI bot:

• enables search
• enables the Cmd-K shortcut
• hides the default button
• move the button to the top nav bar and stylizes it

Direct preview link 👉 here

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To do:

• [x] Improve styling on mobile

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Name	Status	Preview	Comments	Updated (UTC)
documentation	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 4, 2024 2:27pm