Update quick-install.md

doc/quick-install.md

@@ -71,6 +71,12 @@ Enjoy!
 
 ## Deinstall
 
+```sh
+apt-get purge jigasi
+apt-get purge jitsi-meet
+apt-get purge jitsi-videobridge
+```
+
 Somethimes the following packages will fail to uninstall properly:
 
 - jigasi