javascript based cookie setting and redirect, removed ruby cookie handling

assets/javascripts/wizard-custom-guest.js

@@ -1,3 +1,4 @@
-(function() {
-  window.location.href = "/login";
-})();
+(function () {
+  document.cookie = `destination_url=${window.location.href}`
+  window.location.href = '/login'
+})()

controllers/wizard.rb

@@ -5,12 +5,6 @@ class CustomWizard::WizardController < ::ApplicationController
   helper_method :wizard_page_title
   helper_method :theme_ids
 
-  before_action :handle_login_redirect, unless: :current_user
-
-  def handle_login_redirect
-    cookies[:destination_url] = "/w/#{params[:wizard_id]}"
-  end
-
   def wizard
     CustomWizard::Template.new(PluginStore.get('custom_wizard', params[:wizard_id].underscore))
   end