Add Storybook stories
Generate design token output

feat(DesignTokens): add theme design tokens

See merge request gitlab-org/gitlab-ui!4251



Merged-by: Olena Horal-Koretska <ohoralkoretska@gitlab.com>
Approved-by: Dan MH <dmizzi-harris@gitlab.com>
Approved-by: Rahul Chanila <rchanila@gitlab.com>
Approved-by: Olena Horal-Koretska <ohoralkoretska@gitlab.com>
Co-authored-by: GitLab Bot <gitlab-bot@gitlab.com>
Co-authored-by: sdejonge <sdejonge@gitlab.com>

# [80.19.0](gitlab-org/gitlab-ui@v80.18.0...v80.19.0) (2024-06-05)

### Features

* **DesignTokens:** add theme design tokens ([feab27d8](gitlab-org/gitlab-ui@feab27d8))