Yarn pnp support

[AlexYegupov]

Configure project to use yarn p'n'p feature.

Currenly it raises error like:

Error: Package "react-static@5.9.12" (via "/home/av/.cache/yarn/v4/npm-react-static-5.9.12-4dd5
e24b9fa53531c2ccbe966c4223f8b6d0d1bc/node_modules/react-static/bin/react-static-start") is tryi
ng to require the package "babel-register" (via "babel-register") without it being listed in it
s dependencies (@types/react, @types/react-helmet, @types/react-router-dom, async-sema, [...])

This is 50% feature request, 50% error.