docs: thanks to OSUOSL we don't need hosting
docs: public server is API only

Also thus point to a JSON result not the website.
docs: create contributing page

Moves TODO items off the README and into a more appropriate developers
section.
docs: try avoid confusion about where to run export's
docs: warning as errors

'make docs' command added for easy doc building.  Travis uses it now to
check docs instead of the custom command.