Website improvements

[Tom Tryfonidis <tomtryf gmail com>]

Hello all,

I have to propose an updated mockup for the gnome.org, based on this one [1]. I kept the new topbar and added an accordion menu with featured links and a global domain bar with services and websites of GNOME world.

So here is my try (download it for full view)
https://www.dropbox.com/s/5i2xyyr513fs88s/gnome.png?dl=0

[1] https://raw.githubusercontent.com/gnome-design-team/gnome-marketing/master/brand/brand-visuals.png

Tom