feat: add the admin layout shell

templates/booking/index.html.twig

@@ -0,0 +1,7 @@
+{% extends 'layout.html.twig' %}
+
+{% block title %}Meine Buchungen · ephub{% endblock %}
+
+{% block content %}
+    <h1>Meine Buchungen</h1>
+{% endblock %}