Move tailwind z-index config to theme
What does this MR do and why?
Move the z-index tailwind config from theme.extend
to theme
directly. We don't want to use extend because the tailwind z-index scale is quite differently to ours and we don't want people using Tailwind's scale accidentally.
- Tailwind: 0, 10, 20, 30, 40, 50, auto
- GitLab: 0, 1, 2, 3, 200, 9999 (999 in gitlab-ui too)
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Edited by Lorenz van Herwaarden