add admin ability to double card values

public/monitor.js

@@ -174,6 +174,8 @@ function setup_ws() {
       } else if (action === "sound" && args.sound) {
         const { client_id, sound } = args
         sounds[client_id] = new Audio(`sounds/${sound}.mp3`)
+      } else if (action === "double") {
+        q("#board").contentWindow.postMessage("double", "*")
       }
     },
   )