title: nested package.json in Yarn workspaces
body: <p>When using yarn workspaces is it possible to have nested <code>package.json</code> files to resolve dependancies for a subset of packages? Avoiding repetition?</p>
  
  <p>where <code>cra</code> are create-react-apps and <code>pkg</code> are packages that these sites consume.
  e.g.</p>
  
  <pre><code>| /
  | - package.json
  |---- /sites
  |-------- /cra-1
  |         - package.json
  |-------- /cra-2
  |         - package.json
  |---- /packages
  |     - package.json   // &lt;&lt;---- Extra level here
  |-------- /pkg-1
  |         - package.json
  |-------- /pkg-1
  |         - package.json
  |-------- /pkg-2
  |         - package.json
  </code></pre>
  
  <p>this would allow us to share common dependancies for our packages... keep them all in sync and up-to-date</p>