Update migration instructions for Next.js removal

[kaleb110]

Removed additional configuration files related to Next.js migration.

removed files:

next-env.d.ts
proxy.ts
middleware.ts

Summary by CodeRabbit

• Documentation
  • Updated migration guide with expanded cleanup instructions to ensure all related files are properly removed during the framework transition process.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The migration guide documentation was updated to include additional files that should be removed during the Next.js migration process: next-env.d.ts, proxy.ts, and middleware.ts, alongside the previously documented postcss.config.* and next.config.* deletions.

Changes

Cohort / File(s)	Change Summary
Documentation Updates docs/start/framework/react/migrate-from-next-js.md	Expanded the rm command in the "Remove Next.js" step to include three additional files (next-env.d.ts, proxy.ts, middleware.ts) for more comprehensive cleanup during migration

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 Hops through Next.js, file by file,
Cleanup commands make devs smile,
Middleware gone, proxy too,
Migration guide shiny and new! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and accurately summarizes the main change: updating migration documentation to include additional files to remove during Next.js removal.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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