Template cleanup and new Archive page

I created a new page layout to help simplify some of the markup needed for pages like the checklist and resources. 

I also updated the archive page. In light of the comment discussion previously, it seemed like a good idea to at least update the archive page by grouping by categories. Here is a screenshot

![Screen Shot 2013-01-13 at 11 06 18 PM](https://f.cloud.github.com/assets/9383/63724/29b2471c-5e01-11e2-907d-eb6213574cc0.png)

See commits for more detail. Let me know if you think this is too big of a change or if you would like to update anything.