Add About DDD East Anglia page.

Add a new controller action to the Home controller, and an associated View
with some basic markup and content. Include some basic styling of the page
as well, nabbing the fixed menu from here:
http://twitter.github.io/bootstrap/base-css.html
Add link to About DDD page in nav bar.
Flesh out the About DDD page a bit more.

Address the submission questions mentioned by @cerishaw on #39. Voting
is yet to be tackled...