Customise Bootstrap

This commit updates the way our LESS is compiled so that we
can override the default bootstrap UI variables (color, padding,
font, etc) with our own colors. It also introduces the google
fonts inclusion for PT Sans, which is the title font currently
used on Openstack.org.

Change-Id: Id07ed27c4cde6113fc5f6aa483e9b5355d9873c6
Moved homepage content to about page.

There is useful information on the homepage, however that realestate is going to be
more valuable as a project overview dashboard of some kind. In order to preserve the
content that was there, it was moved onto the about page, and the about page has
had its lorem ipsum content removed. I've also added a contribution block in the side
bar for the project.

Change-Id: I6d7b8a5c4a1252df3b19139ba1f4bd73805529d8
Merge "Moved homepage content to about page."