[BUG] In Storybook the file `preview-head.html` isn't added to the rendered story.

[amazingrando]

Describe the bug
When I create the file preview-head.html in $THEME/config/emulsify-core/storybook it should be added to all stories, however that isn't happening.

To Reproduce
Steps to reproduce the behavior:

1. Install Emulsify Drupal (in a site or solo)
2. Create $THEME/config/emulsify-core/storybook/preview-head.html with some code to place in the head.
3. Run npm run develop
4. Go to the site and inspect the story iframe and confirm your code isn't there.

Expected behavior
The code should be added to each story, per https://storybook.js.org/docs/configure/story-rendering#adding-to-head.

Desktop (please complete the following information):

• OS: macOS
• Browser: Any

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