use installed python libs ?

[parmentelat]

question:

what is the purpose of the python-libs folder ? is it always used, or it is used only if these libraries are not installed in the current python environment ?

I am only beginning with vscode extensions, so I don't know what's the common practice, but if it is the former,
shipping pinned libraries like it is done now seems wrong

at the very least we might want to upgrade to jupytext-1.14 - as opposed to 1.11 as it is now