Yarn v2 (berry)

[tiagob]

PnP is enabled by default. Would require #16

Alternatively could use https://github.com/yarnpkg/berry/tree/master/packages/plugin-node-modules which turns off PnP.

This mostly works with a couple of issues.
For server, had a problem loading ormconfig.js but could copy it into index.ts
Lots of YN0002 console warnings when running yarn
https://yarnpkg.com/advanced/error-codes#yn0002---missing_peer_dependency
https://yarnpkg.com/configuration/yarnrc#packageExtensions