Removed obsolete chat clients from chat section

index.html

@@ -105,11 +105,7 @@
           <div class="container" style="text-align: center; margin-top: 20px; margin-bottom: 20px;">
             <a href="https://pidgin.im/" target="_blank"><img src="images/chat/pidgin.svg" alt="Icon of Pidgin." /></a>
             <a href="https://wiki.gnome.org/action/show/Apps/Empathy?action=show&redirect=Empathy" target="_blank"><img src="images/chat/empathy.png" alt="Icon of Empathy." /></a>
-            <a href="https://f-droid.org/repository/browse/?fdfilter=xmpp&fdid=com.beem.project.beem" target="_blank"><img src="images/chat/com.beem.project.beem.15.png" alt="Icon for Beem" /></a>
             <a href="https://f-droid.org/repository/browse/?fdfilter=xmpp&fdid=eu.siacs.conversations" target="_blank"><img src="images/chat/eu.siacs.conversations.165.png" alt="Icon for Converstions" /></a>
-            <a href="https://f-droid.org/repository/browse/?fdfilter=xmpp&fdid=org.tigase.messenger.phone.pro" target="_blank"><img src="images/chat/org.tigase.messenger.phone.pro.15.png" alt="Icon for Tigase" /></a>
-            <a href="https://f-droid.org/repository/browse/?fdfilter=xmpp&fdid=com.xabber.androiddev" target="_blank"><img src="images/chat/com.xabber.androiddev.247.png" alt="Icon for Xabber" /></a>
-            <a href="https://f-droid.org/repository/browse/?fdfilter=xmpp&fdid=org.yaxim.androidclient" target="_blank"><img src="images/chat/org.yaxim.androidclient.19.png" alt="" /></a>
             <a href="https://conversejs.org/" target="_blank"><img src="images/chat/conversejs.png" alt="Icon for Converse.js" /></a>
           </div>
         </div>