Change Docker container from RHEL to Fedora

I've taken the original doc for building a container and updated it to use the semi-official Fedora image.  I've updated the main navigation links as well.  

I modified the Dockerfile and docker.sh to follow along with the blog post from jbrooks since it seemed like a very clean additional to make.  It should be as simple as modifying the FROM image for any non-Fedora user but you get live reads of the source as you make edits to the docker-ized middleman.  It was very handy in writing this doc so I included it.