[Xmonad] darcs patch: Website: Add tip on disabling splash screen to gnome.html

[Don Stewart]

alextarkovsky:
> Borrowed a GNOME tip from a dwm tips page [1]. Thanks to ohmega.
> 
> Also some minor tidying of the html.
> 
> [1] http://code.google.com/p/ohmega-notes/wiki/DWM

Applied, thanks!

-- Don