Refactor to move common parts to a shared layout

[goncy]

Moves the top part of the navbar (including team selector and avatar) to a layout inside /[team] to prevent it to re-render when the /[[...section]] changes (didn't realize the layout re-renders on route changes for optional catch-all segments)

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
parallel-routes	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 19, 2024 4:09pm

[leerob]

Addressed!