convert bitwarden-passwordless-dev from pre to install bash script

[NerdyShawn]

Thank you for wanting to submit a Pull Request to the Civo Kubernetes Marketplace repository!

If your pull request is to submit a new application to the marketplace, please answer the following questions:

• 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?

If your pull request concerns an existing Marketplace application, please make sure you have:

• Notified the Maintainer of the application in this pull request so that they are aware of your proposal.
• Outlined the changes you are proposing, and the reasons these are required (e.g. stability, compatibility with new versions of Kubernetes implementations, etc).
• Tested that the application works with the proposed updates applied (including a screenshot).
• Updated the version number of the app if that has changed.