WIP: Implement admin CRUD

templates/admin/system/training/_form.html.twig

@@ -0,0 +1,14 @@
+{{ form_start(form) }}
+<div class="flex flex-col space-y-4 pb-8">
+    {{ form_row(form.name) }}
+</div>
+<div class="flex items-center space-x-2">
+    <button type="submit" class="btn">
+        Speichern
+    </button>
+    <a href="{{ path('app_admin_system_training_index') }}" class="btn btn--secondary">
+        Abbrechen
+    </a>
+</div>
+{{ form_rest(form) }}
+{{ form_end(form) }}