Point to production build of vue

webroot/index.html

@@ -22,7 +22,7 @@
   <meta name="theme-color" content="#ffffff">
 
   <link href="https://unpkg.com/tailwindcss@^1.0/dist/tailwind.min.css" rel="stylesheet" />
-  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
+  <script src="//cdn.jsdelivr.net/npm/vue@2.6.11/dist/vue.min.js"></script>
 
   <link href="//unpkg.com/video.js@7.9.2/dist/video-js.css" rel="stylesheet">
   <link href="https://unpkg.com/@videojs/themes@1/dist/fantasy/index.css" rel="stylesheet" />