website: clarify that the GNU/Linux client is GTK+ based
Issue generated from Tuleap's migration script. Originally submitted by: Svetlana Tkachenko (gryllida)
Linux is not a desktop platform. GNOME is.
We need to make it clear that we are providing users GNOME installation packages for GNU/Linux distributions. Instead of showing penguin logo, show a combined GNOME and Penguin logo.