Fix deployment and auth links to align with Next.js App Router

[mayur9210]

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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.

[ijjk]

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