Experiment - Druxt + CustomElements

# User story

As a user I want the ability to use Druxt alongside the Custom Elements module.

## From Discord

![image](https://user-images.githubusercontent.com/161090/143112886-35c43ce3-3ce7-48f5-9cc0-b706e2ee83ff.png)

## Links

- https://www.drupal.org/project/custom_elements
- https://www.drupal.org/project/lupus_ce_renderer
- https://stack.lupus.digital/
