gitweb/README: remove reference to git.kernel.org

git.kernel.org no longer uses gitweb but has switched to cgit.

Info about this can be found on: https://www.kernel.org/pelican.html
or simply by looking at http://git.kernel.org . This is change since
2013-03-01.

Signed-off-by: Fredrik Gustafsson <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: iveqy

gitweb/README

@@ -1,9 +1,6 @@
 GIT web Interface
 =================
 
-The one working on:
-  http://git.kernel.org/
-
 From the git version 1.4.0 gitweb is bundled with git.