Remove migrate contrib modules

References #77

composer.json

@@ -28,9 +28,6 @@
         "drupal/hook_event_dispatcher": "^1.28",
         "drupal/markdown": "^1.3",
         "drupal/metatag": "^1.11",
-        "drupal/migrate_plus": "^5.0",
-        "drupal/migrate_source_yaml": "^1.2",
-        "drupal/migrate_tools": "^4.5",
         "drupal/paragraphs": "^1.10",
         "drupal/pathauto": "^1.8",
         "drupal/redirect": "^1.5",