Bottle callback for index.html (/) file.

def _index(self, refresh_time=None):
        """Bottle callback for index.html (/) file."""

        if refresh_time is None or refresh_time < 1:
            refresh_time = self.args.time

        # Update the stat
        self.__update__()

        # Display
        return template("index.html", refresh_time=refresh_time)