Merge second repo

[julien-devatom]

I've raised multiple drawbacks of the mono repo model:

• .gitmodules must be defined at the same level as the .git file. Consequently, we cannot use forge install & all submodules must be installed, even if we need only a part of them. The CI is now taking ~3 minutes to check out the repository.
• husky cannot be used without a global yarn configuration since the husky command must be run at the same level as the .git file.
• I've removed the postinstall script (forge install) since the lint CI is not cloning submodules, so the yarn install step was failing

[MerlinEgalite]

We've decided to isolate repositories