chore: move migrate package to CLI repo (#12971)

Author: benmccann

.changeset/config.json

@@ -6,5 +6,5 @@
 	"access": "public",
 	"baseBranch": "main",
 	"bumpVersionsWithWorkspaceProtocolOnly": true,
-	"ignore": ["!(@sveltejs/*|create-svelte|svelte-migrate)"]
+	"ignore": ["!(@sveltejs/*|create-svelte)"]
 }

.prettierrc

@@ -27,8 +27,7 @@
 				"packages/package/test/fixtures/**/expected/**/*",
 				"packages/package/test/watch/expected/**/*",
 				"packages/package/test/watch/package/**/*",
-				"packages/kit/src/core/postbuild/fixtures/**/*",
-				"packages/migrate/migrations/routes/*/samples.md"
+				"packages/kit/src/core/postbuild/fixtures/**/*"
 			],
 			"options": {
 				"requirePragma": true

README.md

@@ -20,7 +20,6 @@ Web development, streamlined. Read the [documentation](https://svelte.dev/docs/k
 | [@sveltejs/enhanced-img](packages/enhanced-img)                             | [Changelog](packages/enhanced-img/CHANGELOG.md)               |
 | [@sveltejs/package](packages/package)                                       | [Changelog](packages/package/CHANGELOG.md)                    |
 | [create-svelte](packages/create-svelte)                                     | [Changelog](packages/create-svelte/CHANGELOG.md)              |
-| [svelte-migrate](packages/migrate)                                          | [Changelog](packages/migrate/CHANGELOG.md)                    |
 
 [Additional adapters](https://sveltesociety.dev/packages?category=sveltekit-adapters) are maintained by the community.