feat: use bootstrap layout for forms

config/packages/asset_mapper.yaml

@@ -0,0 +1,5 @@
+framework:
+    asset_mapper:
+        # The paths to make available to the asset mapper.
+        paths:
+            - assets/

config/packages/twig.yaml

@@ -1,6 +1,6 @@
 twig:
     default_path: '%kernel.project_dir%/templates'
-
+    form_themes: ['bootstrap_5_layout.html.twig']
 when@test:
     twig:
         strict_variables: true