git site and documentation updated

[Justin Obara]

The main website for git ( http://git-scm.com/ ) has been updated recently. Not only does it have a nice new design and new logo, but it also comes with a revamp to their documentation page ( http://git-scm.com/documentation ). 

The first change was to consolidate the community book and the pro-git book. Both were largely written/maintained by Scott Chacon. The pro-git book is freely avaialble online, and linked to from the documentation page. Additionally there is a series of webcasts about git, which should be great for quickly becoming familiar with git and version control in general. 

- Justin