Keep JS and CSS in separate files

[zaporylie]

IMO it's way better to keep JavaScript code and CSS styles in separate files to keep structure clean and easy to maintain.

[xicubed]

I added the ability to utilize any stylesheet as a querystring parameter e.g. blablabal&url=blablabl&css=blablab. As a part of that I pulled out the css from the index into essay.css and did a test stylesheet as well at alt.css. If Dave merges the pull request #3 that should address the seperate CSS structure you were wanting.