Documentation Basic layout and routing added into

I built out the basic page for the documentation. I've added the routing so I can load the documents.

I'm doing documentation differently with Audience, I've built a small little document editor so I can create and update the documentation.

I wanted to make it really easy for me to create new documents and add them into the docs section, I can just write and hit publish but keep it really simple!

Before I had documentation because you need it but I've tried to put more thought into it and give it more goals:

- Help users understand how to get the most out of Audience.

- Give potential users an idea of what Audience can do for them.

- SEO juice - structure the documentation so that I can get some traffic, how to do X with Y style. I used to do this only with blog posts.