Fix ahoy tracking and visits

config/initializers/ahoy.rb

@@ -1,5 +1,7 @@
 module Ahoy
-  class Store < Ahoy::Stores::ActiveRecordStore
-    # customize here
+  class Store < Ahoy::DatabaseStore
+    def visit_model
+      Visit
+    end
   end
 end

config/routes.rb

@@ -14,6 +14,8 @@ Osem::Application.routes.draw do
                path: 'accounts'
   end
 
+  mount Ahoy::Engine => '/ahoy'
+
   # Use letter_opener_web to open mails in browser (e.g. necessary for Vagrant)
   if Rails.env.development?
     mount LetterOpenerWeb::Engine, at: "/letter_opener"