[thelounge] Replace groups in hosts

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

hosts

@@ -23,9 +23,9 @@ belenios.adm.crans.org
 [certbot:children]
 dovecot
 git
-irc
 radius  # We use certbot to manage LE certificates
 reverseproxy
+thelounge
 
 [dhcp:children]
 routeurs_vm
@@ -88,9 +88,9 @@ monitoring.adm.crans.org
 charybde.adm.crans.org
 
 [nginx:children]
-irc
 mailman
 reverseproxy
+thelounge
 
 [ntp_server]
 charybde.adm.crans.org