* Ask user to add email when deleting [WIP]
* Ask to provide an email before requesting account deletion
* Additional checks to make sure that user won't be deleted w/o an email
* Revert changes on confirm destroy view
* Move from env variables to SiteConfig
Related to #5384
This PR only deals with the first remaining part outlined in the issue, starting to use existing SiteConfig keys instead of the env variables.
* Restore Envfile to original version for now
* Action to request account deletion by email
* Confirmation page for user destroy
* Remove some of the old destroy user code
* System tests for user destroy
* Moved user destroy tokens to redis
* Change tests according to the new user destroy token storage (in redis)
* Added info about the link to user delete confirmation email
* Remove blank like from schema.rb
* Delete user destroy token on user delete
* Update confirm user destroy js
* Start with self deleting account
* Moved deleting user content and activity out of moderator hierarchy
* Added tests for the users delete services
* Tests for Users::DeleteComments
* User self-deletion (start)
* Some tests for user self-delete
* Specs for user self-deletion
* Test flash settings on users delete
* Added basic specs for the Users::DeleteJob
* Send notification when a user was destroyed
* Rename Users::DeleteJob to SelfDelete
* Change texts about self-deletion
* Fix users delete job spec
* Rescue and log exceptions while self-deleting user
* Added visible flash notices after deleting user
* Remove unneeded css for flash notice
* Fix link to a ghost account
* Remove redundant css
* Added github and twitter oauth apps links
