fix for showcases overlapping the nav bar.

[FinumSamBrun]

fixed overlapping of components that were using z-indexes in the showcase with the nav bar by overwriting said z-index for the entire showcases. the stacking order inside of the component should stay the same

What I did

1. set the z-index for the div containing the showcase to 0, overwriting the z-inxed defined by the componements below. The stacking inside of the component should be unaffected

[changeset-bot]

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Latest commit: 3bf393d

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