Remove yarn as project dependency

[Raruto]

As the friendly Docker log suggests:

warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynchronized lock files. To clear this warning, remove package-lock.json.

If there is no particular reason to use yarn, I would recommend using only npm as the sole package manager (as in the case of g3w-client).

Raruto