Enhance Workspaces setup for GitLab UI
With https://gitlab.com/gitlab-org/gitlab-ui/-/merge_requests/5023+ (Thanks @ealcantara!) the [GitLab UI](https://gitlab.com/gitlab-org/gitlab-ui) is Workspaces ready for contributors.
We also have some documentation here https://gitlab.com/gitlab-org/gitlab-ui/-/blob/main/doc/contributing/workspaces.md for users to reference.
The purpose of this issue is to enhance and amplify that. Particularly cause we have other tools like Gitpod mentioned here https://gitlab.com/gitlab-org/gitlab-ui/-/tree/main?ref_type=heads#quick-start---development in the root readme of the project.
## Acceptance Criteria
- [ ] The GitLab UI root README is updated to mention GitLab Workspaces as a development environment
- [ ] The documentation in doc/contributing/workspaces.md is linked or referenced in the README to guide users on setting up Workspaces.
- [ ] TBD on making our setup competitive. See note: https://gitlab.com/gitlab-org/gitlab/-/issues/525561#note_2403795360.
- [ ] TBD on more messaging options to increase reach
issue