Admin can deactivate their own account

[Zrrrpy]

Part of epic #4

What type of user is this for? [admin/supervisor/volunteer/all or All CASA Admin]
admin

Where does/should this occur?
On the <"https://casa-r4g-staging.herokuapp.com/users/edit">edit profile page for Admins.

Log in to staging and use these credentials to access the admin dashboard:
username – casa_admin1@example.com
password – 123456

Description
Admins should be able to deactivate their own accounts. There should be a distinguished button on an Admin's edit profile page that does this.

Note: If there is only one active admin account, the user should not be able to deactivate themself. When they try, they should see an error message that reads: Contact your administrator at Ruby For Good to deactivate this account.

[KatherineMuedas]

Hello @Zrrrpy , I've been looking at the User Model and we have an active boolean attribute. Can we use that active attribute to deactivate an account? If so, when deactivating the account the active would change from true to false.