Update feature flags empty state
What does this MR do?
Update feature flags empty state according to https://gitlab.com/gitlab-org/gitlab-ce/issues/40468.
- Align buttons in the center.
- Remove double top border.
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Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
EE specific content should be in the top level /eefolder -
For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?
Edited by George Tsiolis