remove XMPP servers, link to awesome-sysadmin

README.md

@@ -118,14 +118,12 @@ See also [Static Site Generators](#static-site-generators) and  [Content Managem
   * [Roundcube](https://roundcube.net) - A web interface to act as an IMAP frontend ([Screenshots](https://roundcube.net/screens/)) ([Source code](https://github.com/roundcube/roundcubemail/)) `GPLv3` `PHP`
 
 ### XMPP
+
+For a list of XMPP servers, see https://github.com/n1trux/awesome-sysadmin#xmpp
+
   * [Converse.js](https://conversejs.org/) - A free and open-source XMPP chat client in your browser ([Source](https://github.com/jcbrand/converse.js)) `MPL` `Javascript`
-  * [ejabberd](http://www.ejabberd.im) - A robust, scalable, and extensible XMPP server - `GPL` `Erlang`
   * [Kaiwa](http://getkaiwa.com) A modern XMPP Web client ([Source code](https://github.com/digicoop/kaiwa))
   * [Kontalk](http://kontalk.org/) – Kontalk is an Open Source Messenger, similiar to WhatsApp (app for android only currently), including end-to-end encryption, server is based on Tigase XMPP Server - ([Source code](https://github.com/kontalk)) - `GPLv3`
-  * [Metronome](http://www.lightwitch.org/metronome) – XMPP server forked from Prosody. `MIT` `Lua`
-  * [OpenFire](http://www.igniterealtime.org/projects/openfire/) - instant messaging (XMPP) and groupchat server `Apache` `Java`
-  * [Prosody](http://prosody.im/) – Lightweight XMPP server `Lua` `MIT`
-
 
 ### VoIP
   * [FreeSWITCH](https://freeswitch.org/) - Scalable open source cross-platform telephony platform `MPL` `C`