Fix contrast issues with index hero.

The first line of text had a background line straight
through it, and the contrast of the green text on blue
was not very good, leading to less readable text.

This patch makes the background lines very faint, increases
the lightness of the green text, and aligns it with the
background lines at the top so that the first line doesn't
clash at all.
Add architecture documentation

This patch adds an overview of the architecture
of the OpenStack cluster that will be deployed
to the documentation section.
Change Openstack to OpenStack

Trademarks and stuff.
Add chmod to make build directory readable
Change fetch to pull
Replace Openstack with OpenStack

Conflicts:
	website/source/index.html.erb
Fix pull directory