[#694] allow users to disable their own account

API

POST /api/pleroma/disable_account

Returns: {"status": "success"} or {"error": "message"}

Parameters

Name	Description	Required
password	User's password	Yes

TODO

• api endpoint (/api/pleroma/disable_account)
• a new :users_deactivated_index index ((info->'deactivated'))
• hide deactivated users and their activities
• add tests