chore: add a rewrite for /demo

[moldy530]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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PR-Codex overview

This PR focuses on adding a new rewrite rule in the vercel.json configuration file to redirect requests from /demo to an external demo application.

Detailed summary

• Added a new rewrite rule:
  • source: /demo
  • destination: https://aa-sdk-ui-demo.vercel.app/

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 30, 2024 9:45pm
aa-sdk-ui-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 30, 2024 9:45pm

[moldy530]

aight yea this doesn't work since the rest of the next calls don't get rewritten, there might be some more we can do with the rewrites, but will revisit later