add debug mode

public/main/index.html

@@ -4,6 +4,13 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Pedidos Express</title>
+    ,<script>
+      const params = new URLSearchParams(window.location.search);
+      const debug = params.get("debug") === "1";
+      if (!debug) {
+        window.location.replace("https://menu.fu.do/klein/qr-menu")
+      }
+    </script>
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
     <link