feat: remove_key fix

[JuliannaReyes]

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[JuliannaReyes]

Under the issues section of theupdateframework github the command to remove-key said, "It would be nice to have a separate command that removed the key, something like tuf remove-key role keyed". Based on the description I thought the goal was to create a separate command.

[rdimitrov]

Closing this one since the code base changed and is no longer relevant. Thanks for your help @JuliannaReyes.

The new code base should be much easier to work with so feel free to give it a go and contribute again if you find something interesting 👍