Generate the Sphinx `conf.py` configuration file

        Returns:
            (str): the contents of the `conf.py` file.

def conf(self):
        """Generate the Sphinx `conf.py` configuration file

        Returns:
            (str): the contents of the `conf.py` file.
        """
        return self.env.get_template('conf.py.j2').render(
            metadata=self.metadata,
            package=self.package)