Mention that anonymous login is supported.

demo/anonymous.html

@@ -41,10 +41,6 @@
                     <div class="col-md-8 col-md-offset-2">
                         <h1 class="brand-heading"><i class="icon-conversejs"></i>Converse.js</h1>
                         <p class="intro-text">Anonymous login demo</p>
-                        <p class="intro-text">
-                            Converse.js will only work on this page if you have 
-                            <a href="https://conversejs.org/docs/html/development.html">set up the development environment</a>.
-                        </p>
                     </div>
                 </div>
             </div>

index.html

@@ -151,6 +151,7 @@
                             <li>Server-side archiving of messages (<a href="http://xmpp.org/extensions/xep-0313.html" target="_blank">XEP 313</a>)</li>
                             <li>Client state indication (<a href="http://xmpp.org/extensions/xep-0352.html" target="_blank">XEP 352</a>)</li>
                             <li>Off-the-record encryption</li>
+                            <li>Supports anonymous logins, see the <a href="https://conversejs.org/demo/anonymous.html" target="_blank">anonymous login demo</a>.</li>
                             <li>Translated into 16 languages</li>
                         </ul>
                 </div>