API to remove/disable firefighter account

[luistorres]

A Firefighter can be part of the team (and therefore, displayed in the app) based on their will/minimum requirements achieved during last year.

Due to this, we need a easy way to remove them from the app. If we ignore history, which is something we can do for now, as it's not a priority, we can just remove it. If we decide to keep history, then we need a way to enable/disable accounts.