doc: Adds Python to index and sets maxdepth to 2.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Added inline literal tag.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Added Python doc.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>