chore(vercel): add errors and warnings subdomain redirects

[ndom91]

NOTE:

• It's a good idea to open an issue first to discuss potential changes.
• Please make sure that you are NOT opening a PR to fix a potential security vulnerability. Instead, please follow the Security guidelines to disclose the issue to us confidentially.

☕️ Reasoning

• Add redirects:
  • errors.authjs.dev -> authjs.dev/reference/errors
  • warnings.authjs.dev -> authjs.dev/reference/warnings
• Update link to old docs in banner

🧢 Checklist

• Documentation
• Tests
• Ready to be merged

🎫 Affected issues

Please scout and link issues that might be solved by this PR.

Fixes: INSERT_ISSUE_LINK_HERE

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

[vercel]

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Name	Status	Preview	Comments	Updated
auth-docs	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Dec 16, 2022 at 0:58AM (UTC)
next-auth	🔄 Building (Inspect)			Dec 16, 2022 at 0:58AM (UTC)

1 Ignored Deployment

Name	Status	Preview	Comments	Updated
next-auth-docs	⬜️ Ignored (Inspect)			Dec 16, 2022 at 0:58AM (UTC)