Yarn PnP support (also for the templates)

[DanielRuf]

What is missing?

Yarn nightly has the new PnP feature which requires

  "installConfig": {
    "pnp": false
  }

So far it seems it does not work with 6.4.3. We should test this with Foundation 6.5.0

What is wrong now ?

[tbd]

Possible Solution

[tbd]

Context

yarnpkg/rfcs#101

yarnpkg/yarn#6382

reddit.com/r/node/comments/9fh89w/yarn_plugnplay_getting_rid_of_node_modules

Your Environment

• Foundation version(s) used:
• Browser(s) name and version(s):
• Device, Operating System and version:

Checklist

• I have read and follow the CONTRIBUTING.md document.
• here are no other issues similar to this one.
• The issue title and template are correctly filled.