First-class experience builder support

Very cool to see this happening! 🤩

I updated the proposed resolution with a more detailed implementation plan as well as 📌 Prototype rendering JavaScript components with Nuxt Active .

After solving the nuxt-based component rendering I was a bit hesitant we are on the right track here, since the traditional Drupal theme's site-layout is just coming into our way. After planning out the big picture, I think it can work well if we achieve the following:
* Make the full-page preview of XB directly use the frontend via iframe
* Somehow avoid showing Drupal-theme site-layout in XB canvas - make the editor provide a blank canvas.