Add nav item for UI redesign doc

Marcin Sedlak-Jakubowski (ex-GitLab)requested to merge
msj-redesign-doc-nav into main

Add navigation item to global navigation

  • Link to the merge request that introduced the new page: gitlab-org/gitlab!204403 (merged)
  • Give the MR a descriptive title.
  • Optional. Link to the review app showing the new page:

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