Remove storybook from theme settings and reduce the number of files committed to repository

richardgaunt → credited joshua1234511 → .

https://github.com/civictheme/monorepo-drupal/pull/1331
PR ready for review

Implemented with:
https://github.com/civictheme/uikit/pull/477

fionamorrison23 → credited danielgry → .

Verified and tested on 1.x-dev

Testing Results:
1. Storybook section is no longer visible in theme settings
2. storybook-static files are not present
3. storybook-static is expectedly present in .gitignore

Screenshot:

Automatically closed - issue fixed for 2 weeks with no activity.