refactor: ♻️ rewrite migrations frontend/backend (#841)

* refactor(frontend): ♻️ rewrite migrations UI

* refactor(backend): ♻️ rewrite recipe migrations

* remove vue-demi

Co-authored-by: hay-kot <hay-kot@pm.me>

mealie/schema/group/group_migration.py

@@ -0,0 +1,12 @@
+import enum
+
+from fastapi_camelcase import CamelModel
+
+
+class SupportedMigrations(str, enum.Enum):
+    nextcloud = "nextcloud"
+    chowdown = "chowdown"
+
+
+class DataMigrationCreate(CamelModel):
+    source_type: SupportedMigrations