[docs] no more migrators from expo build (#26961)

# Why

Are people still migrating from classic builds? It's been so long since
we've shut it off, it may be better off archived.

# How
 - move expo build migration to archive
 - add redirects to archive

# Test Plan

<!--
Please describe how you tested this change and how a reviewer could
reproduce your test, especially if this PR does not include automated
tests! If possible, please also provide terminal output and/or
screenshots demonstrating your test/reproduction.
-->

- [ ] manually inspected

# Checklist

<!--
Please check the appropriate items below if they apply to your diff.
This is required for changes to Expo modules.
-->

- [ ] Documentation is up to date to reflect these changes (eg:
https://docs.expo.dev and README.md).
- [ ] Conforms with the [Documentation Writing Style
Guide](https://github.com/expo/expo/blob/main/guides/Expo%20Documentation%20Writing%20Style%20Guide.md)
- [ ] This diff will work correctly for `npx expo prebuild` & EAS Build
(eg: updated a module plugin).

docs/common/error-utilities.ts

@@ -187,6 +187,7 @@ const RENAMED_PAGES: Record<string, string> = {
   '/workflow/upgrading-expo/': '/workflow/upgrading-expo-sdk-walkthrough/',
   '/workflow/create-react-native-app/': '/more/glossary-of-terms/#create-react-native-app',
   '/expokit/': '/archive/glossary/#expokit/',
+  '/build-reference/migrating/': '/archive/classic-builds/migrating/',
 
   // Development builds redirects
   '/development/build/': '/develop/development-builds/create-a-build/',

docs/constants/navigation.js

@@ -270,7 +270,6 @@ const general = [
     makeGroup(
       'Reference',
       [
-        makePage('build-reference/migrating.mdx'),
         makePage('build-reference/npm-hooks.mdx'),
         makePage('build-reference/private-npm-packages.mdx'),
         makePage('build-reference/git-submodules.mdx'),
@@ -476,6 +475,7 @@ const archive = [
   makeSection('Classic Builds', [
     makePage('archive/classic-updates/building-standalone-apps.mdx'),
     makePage('archive/classic-updates/turtle-cli.mdx'),
+    makePage('archive/classic-builds/migrating.mdx'),
   ]),
   makeSection('Classic Updates', [
     makePage('archive/classic-updates/introduction.mdx'),

docs/deploy.sh

@@ -253,6 +253,7 @@ redirects[eas-update/bare-react-native]=eas-update/updating-your-app
 redirects[worfkflow/publishing]=archive/classic-updates/publishing
 redirects[classic/building-standalone-apps]=archive/classic-updates/building-standalone-apps
 redirects[classic/turtle-cli]=archive/classic-updates/turtle-cli
+redirects[build-reference/migrating]=archive/classic-builds/migrating
 redirects[archive/classic-updates/getting-started]=eas-update/getting-started
 redirects[archived]=archive
 

docs/pages/build/setup.mdx

@@ -78,7 +78,6 @@ To learn more about what happens behind the scenes, see [build configuration pro
 
 Additional configuration may be required for some scenarios:
 
-- Are you migrating an Expo managed app from `"expo build"`? [Learn about the differences](/build-reference/migrating).
 - Does your app code depend on environment variables? [Add them to your build configuration](/build-reference/variables).
 - Is your project inside of a monorepo? [Follow these instructions](/build-reference/build-with-monorepos).
 - Do you use private npm packages? [Add your npm token](/build-reference/private-npm-packages).