Feat: Add edit function for trainings

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

@@ -0,0 +1,9 @@
+{{ form_start(form) }}
+<div class="flex flex-col space-y-4 pb-8">
+    {{ form_row(form.name) }}
+</div>
+<button type="submit" class="btn">
+    Speichern
+</button>
+{{ form_rest(form) }}
+{{ form_end(form) }}