Set new desktop help to go into the desktop category

data/overlay.xml.in

@@ -695,7 +695,10 @@
     	channel="admin" weight="1.0">
       <category>guides</category>
     </document>
-    <document doc_module="user-guide" channel="users" weight="1.0"/>
+    <document doc_module="gnome-help" channel="users" weight="1.0">
+      <category>index</category>
+    </document>
+    <document doc_module="user-guide" channel="users" weight="0.99"/>
     <document doc_module="gdm" old-channel="users" channel="admin">
       <category>manuals</category>
     </document>