chore: remove classy theme and csp module

Refs: ODSG-47

composer.json

@@ -27,15 +27,13 @@
         "drupal/allowed_formats": "^3",
         "drupal/amazon_ses": "^3",
         "drupal/aws": "dev-2.0.x",
-        "drupal/classy": "^1.0",
         "drupal/components": "^3.0@beta",
         "drupal/config_filter": "^2.4",
         "drupal/config_split": "^2.0@rc",
         "drupal/core-composer-scaffold": "^10",
         "drupal/core-dev": "^10",
         "drupal/core-project-message": "^10",
         "drupal/core-recommended": "^10",
-        "drupal/csp": "^1.20",
         "drupal/ctools": "^4.0",
         "drupal/editor_advanced_link": "^2.2",
         "drupal/environment_indicator": "^4.0",
@@ -46,7 +44,6 @@
         "drupal/redirect": "^1.8",
         "drupal/seckit": "^2.0",
         "drupal/social_auth_hid": "^3.2",
-        "drupal/stable": "^2.0",
         "drupal/stage_file_proxy": "^2.1",
         "drupal/user_expire": "^1.1",
         "drupal/username_enumeration_prevention": "^1.3",