Top level Navigation, search and hierarchy merger -> Design spinoff
This is not a real issue, just a showcase to show some designs which spin off the work of https://gitlab.com/gitlab-org/gitlab-ce/issues/28285 and https://docs.google.com/document/d/1xeleY5mQhfXpPGMbTnlqbjH90WGsaG6jaP9pmk75PUs/edit
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