Move walkthrough to shoesrb.com

So whats new, and some notes:
* In order to get syntax highlighting I included [highlight.js](http://softwaremaniacs.org/soft/highlight/en/)
* The Walkthrough specific styling lives in "wt.css"
* I had to write some html in the README.md I hope its not too bad, if you want me to change it, just point me in the right direction.
* I copied all of the walkthrough images to "/img"

We probably won't win any design awards, but I think the design is pretty ok for actually going through the code. I mean its pretty nifty to see the code side by side (in most cases) as opposed to top/bottom. This is of course only my impression, if you spot any errors or have suggestions to improve it further go ahead.

Regards,
Philipp