wip: implement admin crud

templates/admin/user/index.html.twig

@@ -1,9 +1,7 @@
 {% extends 'layout_admin.html.twig' %}
 
 {% block content %}
-    <h1 class="text-2xl font-bold pb-8">
-        Benutzeraccounts
-    </h1>
+    <twig:page:heading>Benutzeraccounts</twig:page:heading>
     <div class="data-table-wrapper">
         <div class="data-table-wrapper__inner text-sm">
             <table class="data-table">