* initial work on sphinx docs; much left to do
* first pass at docs complete; still has some warts
* added requirements for readthedocs
* added requirements for readthedocs
* added requirements for readthedocs
* cleaned up code blocks; scans conform to 1 template for sections
* trying to fix code blocks not rendering on readthedocs
* trying to fix code blocks not rendering on readthedocs
* trying to fix code blocks not rendering on readthedocs
* trying to fix code blocks not rendering on readthedocs
* trying to fix code blocks not rendering on readthedocs
* trying to fix code blocks not rendering on readthedocs