Update Sample for V4

[sukh-gill]

Checklist

• I have looked into the Readme and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
• I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• I agree to the terms within the Auth0 Code of Conduct.

Description

Can the sample be updated for V4
Also, a lot of the links in the V4 migration documentation do not work and are also outdated.

Reproduction

Review The Sample and https://github.com/auth0/nextjs-auth0/blob/main/V4_MIGRATION_GUIDE.md

Additional context

No response

[millermeares]

+1 on this. v4 does not seem to have handleAuth.