Mentions légales du service

This version was not emitted properly right after the training session and has been created just now in February 2024.

Exact changes will be added later (see [issue #110](https://gitlab.inria.fr/formations/cpp/gettingstartedwithmoderncpp/-/issues/110)).

There were 3 lecturers for this session:

- Laurent Steff [^sed-saclay]
- Sébastien Gilles [^sed-saclay]
- Vincent Rouvreau [^sed-saclay]