docs: add routing page

[shahednasser]

• Add a new homepage to book project for the routing page
• Move all main doc pages to be under /v2/learn (and added redirects + fixed links across docs)
• Other: add admin components to resources dropdown + fixes to search on mobile.

Closes DX-955

Preview: https://docs-v2-git-docs-router-page-medusajs.vercel.app/v2

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[kodiakhq]

This PR currently has a merge conflict. Please resolve this and then re-add the automerge label.