Remove the current notebook from the list of paired notebooks

def drop_paired_notebook(self, path):
        """Remove the current notebook from the list of paired notebooks"""
        if path not in self.paired_notebooks:
            return

        fmt, formats = self.paired_notebooks.pop(path)
        prev_paired_paths = paired_paths(path, fmt, formats)
        for alt_path, _ in prev_paired_paths:
            if alt_path in self.paired_notebooks:
                self.drop_paired_notebook(alt_path)