docs: def docs(output=DOC_OUTPUT, proj_settings=PROJ_SETTINGS, github=False):
      """Generate API documentation (using Sphinx).
  
      :param output: Output directory.
      :param proj_settings: Django project settings to use.
      :param github: Convert to GitHub-friendly format?
      """
  
      local("export PYTHONPATH='' && "
            "export DJANGO_SETTINGS_MODULE=%s && "
            "sphinx-build -b html %s %s" % (proj_settings, DOC_INPUT, output),
            capture=False)
  
      if _parse_bool(github):
          local("touch %s/.nojekyll" % output, capture=False)