BUGFIX: Header must not be wrapped in h1 tag

Resources/Private/Fusion/Content/Headline/Content.Headline.fusion

@@ -4,7 +4,8 @@ prototype(Ttree.Cornerstone:Content.Headline) < prototype(Neos.Neos:ContentCompo
         property = 'title'
     }
 
-    renderer = afx`
-        <h1>{props.title}</h1>
-    `
+    renderer = Neos.Neos:Editable {
+        node = ${node}
+        property = 'title'
+    }
 }