Update design.GitLab.com with new brand assets and content
Changes
Landing page:
- Logo and text updated
- Cover gradient updated
- Principles removed (they'll have a dedicated page with https://gitlab.com/gitlab-org/design.gitlab.com/merge_requests/185)
- Text and illustration added explaning intent and usage of pajamas
Sidebar:
- Logo updated with official GitLab logo + hover animation
Screenshot
Edited by Dimitrie Hoekstra