[Website] Resolve the Blueprint declaration for the 'View Blueprint' button - #2675

Motivation for the change, related issues

Improves the #2562 situation in that it brings over the Blueprint to the JSON editor when you click "View Blueprint". It's still not a full solution as the editor doesn't seem to support the "bundled" resources at the moment, e.g.

    {
      "step": "writeFile",
      "path": "/wordpress/wp-content/mu-plugins/rewrite.php",
      "data": {
        "resource": "bundled",
        "path": "./scripts/setup.php"
      }
    },

Still, it improves the user experience so we might land it and keep thinking.

cc @bph @brandonpayton

Testing Instructions (or ideally a Blueprint)

Follow the steps in #2562 and confirm the Blueprint editor shows the correct JSON file.