Use the same formatting for all books
@nicolas.thiery did a great job about formatting for init-laby (see https://foss.heptapod.net/py-edu-fr/py-edu-fr/-/merge_requests/12).
It would be much better to use the same formater for all books. Also for https://foss.heptapod.net/py-edu-fr/py-edu-fr/-/blob/branch/default/noxfile.py
issue