Remove D-Bus DOS page

This page appears to be a status page for the implementation of D-Bus
resiliance. The page provides links to numerous fixed bug reports and test
cases, but no information that remains relevant approx 6 years since it
was authored.

Removed the page in increase clarity of information on Apertis website.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>