Display the entry as a rich object in an IPython session.

def _ipython_display_(self):
        """Display the entry as a rich object in an IPython session."""
        contents = self.describe()
        display({  # noqa: F821
            'application/json': contents,
            'text/plain': pretty_describe(contents)
        }, metadata={
            'application/json': {'root': contents["name"]}
        }, raw=True)