apps: remove VM Manager android app

The VM Manager app is no longer present on the Play store and while
Google shows a couple of hits they look like the typical untrustworthy
3rd party download redistributors rather than an official site.
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

docs/apps.html.in

@@ -457,17 +457,6 @@
       </dd>
     </dl>
 
-    <h2><a id="mobile">Mobile applications</a></h2>
-
-    <dl>
-      <dt><a href="https://market.android.com/details?id=vm.manager">VM Manager</a></dt>
-      <dd>
-        VM Manager is VM (libvirt) manager (over SSH) application. VM Manager
-        is an application for libvirt VM / Domain management over SSH.
-        Please keep in mind that this software is under heavy development.
-      </dd>
-    </dl>
-
     <h2><a id="other">Other</a></h2>
 
     <dl>