/configure-delegatorroles remove provides a simple command to remove existing delegation roles. All you need to do is call the command with the respective delegator role ID.
If you remove the last delegator role that is managing a Discord role, all users that currently still have this role in Discord will remain unchanged. Vibrant will not remove any assigned users after this point.
The delegator role ID which you would like to remove. You can find this ID via /configure-delegatorroles list.