move adagios to awesome-sysadmin

part of https://github.com/Kickball/awesome-selfhosted/issues/127

README.md

@@ -402,7 +402,6 @@ Some [Groupware](#groupware) solutions also feature file sharing synchronization
 
 ## Monitoring and Administration
 
-  * [Adagios](http://adagios.org/) - Web based Nagios interface for configuration, as well as monitoring (as a replacement to the standard interface), and a REST interface ([Demo](http://demo.adagios.org/), [SourceCode](https://github.com/opinkerfi/adagios), [Documentation](https://github.com/opinkerfi/adagios/wiki)) - `GPLv3` `Python`
   * [adminer](http://www.adminer.org/) -  Database management in a single PHP file ([Source code](https://github.com/vrana/adminer))
   * [Icinga / Icinga 2](https://www.icinga.org/) - Nagios fork that has since lapped nagios several times. Comes with the possibility of clustered monitoring - ([SourceCode](https://github.com/Icinga)) - `GPLv2`
   * [LibreNMS](http://www.librenms.org/) - Community-based GPL-licensed network monitoring system - `GPLv3`