Remove traces of irssi server setup.

[config] / mails / weechat_restart_reminder

[SYSADMIN] weechat restarted, re-identify!

Your weechat was restarted, so don't forget to re-identify on freenode to
nickserv via "/msg nickserv identify [password]", and on bitlbee by joining
&bitlbee, "identify", "/oper . [password]", and "account on".