Project links page (and main page)

[Owen Fraser-Green]

Hi,

It occurred to me that maybe it would be useful to add a "Projects using
D-BUS" page both to raise the profile of D-BUS and it's passengers and
also to serve as a source of examples for wannabe D-BUSers. I'd be happy
to add a page with those I know about if there are no objections.

While we're on the subject, should we maybe move the older releases onto
a separate archive page as about 75% of the dbus.freedesktop.org front
page is now a changelog.

Cheers,
Owen