feat: show remote cursors when in collaboration.

[dpnova]

Checklist

• yarn typecheck
• yarn lint:fix
• yarn test
• yarn brl
• yarn changeset
• ui changelog

This pulls in and extends Overlay.tsx from the @slate-yjs example on rendering remote cursors. It fades the cursors slightly by default and makes them more solid on hover.

closes: #2527

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Latest commit: 7b7f7b3

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[dpnova]

@zbeyens enough changes now that I'd feel more comfortable after giving it all a test run from a blank template. Might help with docs content too.