Repaired docs

I repaired the docs by adding the css and cleaning up some of the files. I commented out __text-rendering: optimizeLegibility__ (https://github.com/lcfg/Chart.js/commit/6443bf57e043b44c221c172af728a7208cf2e26f#L0R109) because I've read that it might cause performance issues when used on large pieces of text. 

I realize the official chart.js repository is back online, but it might be worth adding the proper documentation if only for archival purposes.