Root path should resolve

[mwvaughn]

The / path should resolve to something useful when accessed by a browser.

Some possibilities:

• Redirect to ReadTheDocs
• Return a simple HTML page
• Redirect to /docs

[mwvaughn]

Closed in e04e619cb6f7e82a09f17610636c354ad247cbc1 - we return a JSON document with helpful pointers to auth, docs, and status URLs.