docs: def generate_static_site(self, output_root=None, extra_context=None):
          """
          Bake out static site
          """
          self.app.config['BUILD_PATH'] = output_root
  
          # use this hook for registering URLs to freeze
          self.call_hook("generate", self, output_root, extra_context)
  
          if output_root is not None:
              # realpath or this gets generated relative to the tarbell package
              self.app.config['FREEZER_DESTINATION'] = os.path.realpath(output_root)
  
          self.freezer.freeze()