Add method to update contestants through admin UI

config/routes.rb

@@ -36,6 +36,8 @@ Rails.application.routes.draw do
   post "connect", to: "messages#connect"
   post "message", to: "messages#create"
 
+  post "update_contestants", to: "users#update_contestants"
+
   get "public/:id", to: "contests#scoreboard"
   get "public/:id/offline", to: "contests#offline_new"
   post "public/:id/offline", to: "contests#offline_create"