Upgrade botka, deploy for Libera.Chat to nodejs-2

Note: Temporarily disables wormhole, because it's still on Freenode,
where its credentials have been deleted by the new "management".

site-cookbooks/kosmos-hubot/attributes/default.rb

@@ -1,7 +1,6 @@
 node.default['hal8000']['http_port'] = 8080
 
-node.default['botka_freenode']['http_port'] = 8081
-node.default['botka_freenode']['domain'] = "freenode.botka.kosmos.org"
+node.default['botka_irc-libera-chat']['http_port'] = 8081
 
 node.default['hal8000_xmpp']['http_port'] = 8082
 node.default['hal8000_xmpp']['domain'] = "hal8000.chat.kosmos.org"