Remove unused features from config

lua/plugconfig.lua

@@ -25,12 +25,6 @@ require("pascal_mode")
 -- Ada mode (supported by plugins)
 require("ada_mode")
 
--- Mail configuration
--- require("mail")
-
--- IRC configuration
--- require("irc_client")
-
 -- Misc configuration
 if vim == nil then
 	vim = {}