We no longer have a separate mobile build

mobile.html

@@ -16,8 +16,8 @@
     <link type="text/css" rel="stylesheet" media="screen" href="https://cdn.conversejs.org/css/mobile.min.css" />
     <script type="text/javascript" src="analytics.js"></script>
     <noscript><p><img src="//stats.opkode.com/piwik.php?idsite=1" style="border:0;" alt="" /></p></noscript>
-    <![if gte IE 9]>
-        <script src="https://cdn.conversejs.org/dist/converse-mobile.min.js"></script>
+    <![if gte IE 11]>
+        <script src="https://cdn.conversejs.org/dist/converse.min.js"></script>
     <![endif]>
 </head>