build the doc locally and view

def html(theme_name='readthedocs'):
    # disable Flask RSTPAGES due to sphinx incompatibility
    os.environ['RSTPAGES'] = 'FALSE'
    theme(theme_name)
    api()
    man()
    """build the doc locally and view"""
    clean()
    local("cd docs; make html")
    local("fab security.check")
    local("touch docs/build/html/.nojekyll")