title: GraphQL Query access all transformed json files within a folder located in subdirectories
body: <p>I have a project structure like so:</p>
  
  <pre><code>-$PROJECT
  --src
  ---data
  ----projects
  -----project1
  ------project.json
  ------images
  -------project1-preview.png
  -----project2
  ------project.json
  -------images
  ...
  </code></pre>
  
  <p>And so on, for however many projects. I could query these project.json files when they were named the title of the project and within a <code>projects</code> folder using <code>allProjectsJson</code> in graphQl, however now they are within subfolders within <code>projects</code>. I can only query them individually as allProject1Json and so on. Is there a way to query allProjectsJson so I get all the project.json files?</p>
  
  <p>I can find my projects files by querying <code>allFile</code> with a filter for json files, however, these files are not transformed json so I can't access the elements. </p>
  
  <p>In my gatsby-config file I am importing src/data as a source for files.</p>