Update main page for initial beta release

This updates the main API documentation page (closes #122).

These changes and the yet unmerged pull requests #116 (new data conversion) and #121 (update queries and views) are deployed to Quaoar. Together, this is our initial beta release. It probably makes sense to merge this after #116 and #121, but @dr0i and @acka47 please check it out and give me your +1s so we can start pointing people to it:

http://api.lobid.org/