Remove no longer supported CombatNet

docs/_docs/modding/door-servers.md

@@ -40,22 +40,5 @@ doorParty: {
 
 Fill in `username`, `password`, and `bbsTag` with credentials provided to you and you should be in business!
 
-## The CombatNet Module
-The `combatnet` module provides native support for [CombatNet](http://combatnet.us/). Add the following to your menu config:
-
-````hjson
-combatNet: {
-    desc: Using CombatNet
-    module: combatnet
-    config: {
-        bbsTag: CBNxxx
-        password: XXXXXXXXX
-    }
-}
-````
-Update `bbsTag` (in the format CBNxxx) and `password` with the details provided when you register, then
-you should be ready to rock!
-
 ## The Exodus Module
-
 TBC