remove irc artefact

camp.html

@@ -59,7 +59,7 @@
     <h2>Contacting us</h2>
     <p>During the event we run the logistics helpdesk in our tent in the south of the terrain and can be contacted in person.</p>
 
-    <p>For important topics and requests our ticket system is the preferred contact point. For quick questions and troubleshooting please use our IRC or Rocket.Chat channel.</p>
+    <p>For important topics and requests our ticket system is the preferred contact point. For quick questions and troubleshooting please use our Rocket.Chat channel.</p>
 
     <table>
         <tr>

congress.html

@@ -60,7 +60,7 @@
     <h2>Contacting us</h2>
     <p>During the event we run the logistics helpdesk in hall 4 and can be contacted in person.</p>
 
-    <p>For important topics and requests our ticket system is the preferred contact point. For quick questions and troubleshooting please use our IRC or Rocket.Chat channel.</p>
+    <p>For important topics and requests our ticket system is the preferred contact point. For quick questions and troubleshooting please use our Rocket.Chat channel.</p>
 
     <table>
         <tr>