Merge pull request #1 from al-maisan/master

documentation outline
Remove reference to unused _static directory

We don't have any static files at the moment, so this caused a warning
when the docs were built:

  WARNING: html_static_path entry u'/_static' does not exist
Use ZeroVM theme
Merge pull request #2 from mgeisler/master

Use ZeroVM theme
documentation work in progress