Update WebKit.org's contact page

Update WebKit.org's contact page
https://bugs.webkit.org/show_bug.cgi?id=113968

Patch by Benjamin Poulain <bpoulain@apple.com> on 2013-04-04
Reviewed by Geoffrey Garen.

* contact.html:
-Add a direct link to our archives on Gmane.
-References the ports mailing-lists. This may reduces the emails
 erroneously sent to webkit-dev.
-Add a link to our "reporting bug page".
-Get rid of the link to CIA. The website is dead.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@147697 268f45cc-cd09-0410-ab3c-d52691b4dbfc