Fix deployment and auth links to align with Next.js App Router (#71589)
This PR addresses the following fixes:
**fix: update the deployment link to Next.js App Router**
- Updated the deployment link to point to the Next.js App Router instead
of the Pages Router since the example now has the pages router
**fix: App Router deployment link for app-dir-i18n-routing example**
- Corrected the deployment link for the app-dir-i18n-routing example to
match the App Router deployment structure.
**fix: Stytch auth link updated to Next.js**
- Updated the Stytch authentication link to work with the Next.js setup,
previous link was pointed to Javascript example.
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Co-authored-by: JJ Kasper <jj@jjsweb.site>