feat: notify configured recipients when something is booked

templates/admin/resources.html.twig

@@ -53,6 +53,10 @@
             <div class="flex flex-wrap items-baseline justify-between gap-2">
                 <h2>{{ type.plural }}</h2>
                 <div class="flex gap-2">
+                    {{ _self.opener(
+                        path('app_admin_resource_type_notifications', { type: type.value }),
+                        section.recipients > 0 ? 'Benachrichtigungen (' ~ section.recipients ~ ')' : 'Benachrichtigungen'
+                    ) }}
                     {{ _self.opener(path('app_admin_resource_group_new', { type: type.value }), type.groupLabel ~ ' hinzufügen') }}
                     {{ _self.opener(path('app_admin_resource_new', { type: type.value }), type.label ~ ' hinzufügen', 'primary') }}
                 </div>