remove ZNC from services (#565)

Our ZNC instance was sunset last year, so we shouldn't be advertising it on our website anymore.

Reviewed-on: #565
Reviewed-by: Shahan Nedadahandeh <snedadah@csclub.uwaterloo.ca>
Co-authored-by: Max Erenberg <merenber@csclub.uwaterloo.ca>
Co-committed-by: Max Erenberg <merenber@csclub.uwaterloo.ca>

content/resources/services/irc.md

@@ -4,6 +4,4 @@ title: IRC
 
 We host an instance of [The Lounge](https://chat.csclub.uwaterloo.ca/) for all of our members. The Lounge is a web-based IRC client which is simple to setup and use. It also has a Progressive Web App available for mobile devices.
 
-We also host an instance of [ZNC](https://znc.csclub.uwaterloo.ca/) for those who wish to use their own IRC client but do not want to run their own bouncer. ZNC saves your messages persistently so you do not have to keep your IRC client running 24/7.
-
 For more information, see [this page](https://wiki.csclub.uwaterloo.ca/How_to_IRC) on our wiki.