website: Add autologin and nick selection to WebChat link

Author: techtonik

website/www/contact.txt

@@ -13,7 +13,7 @@ These lists are moderated to protect them against spam.
 Please sign up if you intend to mail repeatedly.
 
 You may talk to Roundup developers directly via IRC irc://irc.oftc.net/roundup
-using IRC client or through `WebChat <https://webchat.oftc.net/>`_ interface.
+using IRC client or through WebChat_ interface.
 
 
 .. _roundup-users: https://lists.sourceforge.net/lists/listinfo/roundup-users
@@ -29,3 +29,5 @@ using IRC client or through `WebChat <https://webchat.oftc.net/>`_ interface.
 .. __: http://roundup.1086182.n5.nabble.com/Developer-f3.html
 
 .. __: https://sourceforge.net/mailarchive/forum.php?forum_name=roundup-checkins
+
+.. _WebChat: http://webchat.oftc.net/?randomnick=1&channels=roundup&prompt=1