make sphinx docs
Merge branch 'master' of github.com:slowkow/snpsea
remoe unneeded files
move docs to readthedocs
Add link to github
remove _build
fix links
update links
fix link spacing
fix link spacing
move up license
fix links in introduction

Also, make the note about normalization more noticeable and add a link to
quantilize normalization.
delete old manual