Run recursive yarn install for deps

`yarn install` only gets deps for the top level package.json, custom
script `yarn setup` will get deps for all three nested package.json
folders (/, /polygerrit-ui, /polygerrit-ui/app)

Change-Id: I507bdbfea617f401b766f15d3a0ab2e676471cac
1 file changed
tree: 90795596197dcafa4d2957d54923436b16cc8a53
  1. generated/
  2. infra/
  3. recipes/
  4. .gitignore
  5. main.star