Getting Started page

I got some feedback that the Getting Started page was a little overwhelming, so I put basic doc for a couple of the most common tasks (finding packages and using them) at the top of the page. Some of the new text is very similar to what's on the individual package pages, but I figured that's better than saying the same thing a different way for no good reason.

Is this (forking and a pull request) the best way to work on the docs?

Also, even if all the changes look perfect, please check the markup before posting. (I checked the markdown, but I haven't been able to build the site.)

-k-