docs/website: remove reference to GMane

GMane is dead (at least its web interface), so it's no longer really
useful to reference it.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

docs/website/support.html

@@ -45,11 +45,6 @@
 		    Only subscribers to the Buildroot mailing list are allowed to post
 		    to this list.</p>
 
-		  <p>The list is also available
-		    through <a href="http://gmane.org">Gmane</a>
-		    at <a href="http://dir.gmane.org/gmane.comp.lib.uclibc.buildroot">gmane.comp.lib.uclibc.buildroot</a>.
-		  </p>
-
 		  <h4>Search the List Archives</h4>
 		  <p>Please search the mailing list archives before asking questions on the mailing
 		    list, since there is a good chance someone else has asked the same question