docs: address feedback on quickstart/webapp/nextjs/index.mdx

[nick-gagliardi]

Summary

Addresses negative user feedback on /docs/quickstart/webapp/nextjs.

Diagnosis

The page has a broken hyperlink ("Full agent skills documentation →" leads to a 404) and lacks coverage of third-party backend integrations like Convex (item 2 is a support request stranded by missing docs, not a misrouted ticket); content fix: repair the 404 link and add guidance on passing Auth0 tokens to non-Next.js backends.

Suggestions applied (2)

1. Adds comprehensive guidance on passing Auth0 tokens to third-party backends like Convex, directly addressing the user's frustration:

• I'm at an incredibly frustrating roadblock trying to get Convex setup with Auth0 within my turborepo using Next.js for my apps/web package. I can't seem to get my nextjs auth0 token properly passed through to the convex client so that ctx.auth.getUserIdentity works as expected within convex. There is no appropriate documentation for this and i've been trying to figure this out for a few days now. Please Please Please offer some assistance on this as i'm going absolutely mad.

2. Fix broken hyperlink to agent quickstart.

---

[github-actions]

Summary

Status	Count
🔍 Total	7
✅ Successful	3
⏳ Timeouts	0
🔀 Redirected	2
👻 Excluded	2
❓ Unknown	0
🚫 Errors	0
⛔ Unsupported	0

Redirects per input

Redirects in main/docs/quickstart/webapp/nextjs/index.mdx

• [200] https://docs.npmjs.com/downloading-and-installing-node-js-and-npm | Redirect: Followed 1 redirect resolving to the final status of: OK. Redirects: https://docs.npmjs.com/downloading-and-installing-node-js-and-npm --> https://docs.npmjs.com/downloading-and-installing-node-js-and-npm/
• [200] https://jwt.io/ | Redirect: Followed 1 redirect resolving to the final status of: OK. Redirects: https://jwt.io/ --> https://www.jwt.io/
  Full Github Actions output

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Project	Status	Preview	Updated (UTC)
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