Allow relative redirects beginning with /

URIs from REDIRECT headers which begin with a forward slash now redirect
relative to the BASE_URI.
Remove about/media and about/publicdocs

Both were empty, and have also been removed from the home page menu.

Change-Id: Icce15853c16a1b24c680f673c2014731e483d26b
Add a competition 2013 news piece

Give a brief history of the teams' journey so far and link to some
of the more interesting teams' robot videos showing promise.

Change-Id: I62f1473ef936c2a3ad2eb29316c45191fe6ac431
Merge changes Icce15853,Ie7dd4e72

* changes:
  Remove about/media and about/publicdocs
  Allow relative redirects beginning with /
Merge "Add a competition 2013 news piece"