Fixes #757 - adding Apache superset to the Markeplace

[sundaram2021]

• [ ✅] Have you followed the guidelines in our Contributing document in setting up the application?

• [ ✅] Have you checked that the application your submission is proposing to add does not yet exist on the Marketplace, or as a pull request to be processed?

• [ ✅] Have you tested your application on the Civo managed Kubernetes service? Please include a screenshot.
  
  

• [✅ ] Can you confirm that the software you are submitting licensed for use in a publicly-available Kubernetes marketplace?

• [✅ ] Have you included the specific version of the application to be installed?

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• [ ✅] Notified the Maintainer of the application in this pull request so that they are aware of your proposal.
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• [✅ ] Tested that the application works with the proposed updates applied (including a screenshot).
• [ ✅] Updated the version number of the app if that has changed.