Feature/beautify da urls

Home page clicks now go straight to `tldrcode.com/`.

Use the permalink variable in the YAML frontmatter to have nice URLs.

Before and After - 
http://tldrcode.com/languages/python.html
http://tldrcode.com/python/

Works without the trailing slash as well on my local test vagrant.
http://tldrcode.com/python

This **breaks all of the old links.**