Article overhaul

http://xhmikosr.github.io/nfe/

http://gtmetrix.com/compare/WTK64p39/ftJ1zSRv

It's a little slower due to highlighting and so many `<pre>` stuff, but I guess the improved look and functionality justifies that.

One potential improvement would be to add the affix plugin, but not sure if I'll ever get to do that.