Admin accounts controller cleanup (#1664)

* Remove unused account_params method in admin/accounts controller

* Introduce AccountFilter to find accounts

* Use AccountFilter in admin/accounts controller

* Use more restful routes admin silence and suspension area

* Add admin/silences and admin/suspensions controllers

app/controllers/admin/silences_controller.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module Admin
+  class SilencesController < BaseController
+    before_action :set_account
+
+    def create
+      @account.update(silenced: true)
+      redirect_to admin_accounts_path
+    end
+
+    def destroy
+      @account.update(silenced: false)
+      redirect_to admin_accounts_path
+    end
+
+    private
+
+    def set_account
+      @account = Account.find(params[:account_id])
+    end
+  end
+end