[nextjs] Improve current demo next.js app to cover more grounds

[brijeshb42]

Steps to reproduce

NA

Current behavior

No response

Expected behavior

We don't have enough pages in the demo app to cover a lot of bug reports. We should have a end-to-end test configured to fail on screenshot mismatch of pages.

Context

No response

Your environment

npx @mui/envinfo

  Don't forget to mention which browser you used.
  Output from `npx @mui/envinfo` goes here.

Search keywords: next.js, nextjs