Account deletion (#3728)

* Add form for account deletion

* If avatar or header are gone from source, remove them

* Add option to have SuspendAccountService remove user record, add tests

* Exclude suspended accounts from search

app/controllers/settings/deletes_controller.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class Settings::DeletesController < ApplicationController
+  layout 'admin'
+
+  before_action :authenticate_user!
+
+  def show
+    @confirmation = Form::DeleteConfirmation.new
+  end
+
+  def destroy
+    if current_user.valid_password?(delete_params[:password])
+      Admin::SuspensionWorker.perform_async(current_user.account_id, true)
+      sign_out
+      redirect_to new_user_session_path, notice: I18n.t('deletes.success_msg')
+    else
+      redirect_to settings_delete_path, alert: I18n.t('deletes.bad_password_msg')
+    end
+  end
+
+  private
+
+  def delete_params
+    params.permit(:password)
+  end
+end