next.js

fd8b4c59 - docs: Split "Get Started: Route Handlers and Middleware" to Route Handlers and Proxy (#84708)

docs: Split "Get Started: Route Handlers and Middleware" to Route Handlers and Proxy (#84708) This PR splits the route handlers and middleware to allow for separate onboarding docs, making it easier to migrate the docs from Middleware to Proxy. These PR stacks are to publish a full replacement of the docs for the Middleware to Proxy. Steps are as follows: - Split "Get Started: Route Handlers and middleware" to Route Handlers / Proxy - Clone the Middleware docs for Proxy - Add "Migration to Proxy" section to Middleware docs - Explain the rationale for the renaming to Proxy - Provide migration guide - Add an error doc that the deprecation warning can refer to. The error doc will: - Explain why this error occurred - Provide migration guide - Explain the rationale for the renaming to Proxy