Refactor dashboard example

examples/complete/web_root/index.html

@@ -1,19 +1,12 @@
 <!DOCTYPE html>
 <html lang="en">
   <head>
-    <title>example</title>
+    <title>Device Dashboard</title>
     <meta charset="utf-8" />
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <link rel="stylesheet" href="bootstrap.min.css" />
     <link rel="stylesheet" href="style.css" />
-    <script src="preact.min.js"></script>
-    <script src="preact-router.min.js"></script>
-    <script src="htm.min.js"></script>
-    <script src="history.min.js"></script>
-    <script src="linkstate.min.js"></script>
-    <script src="axios.min.js"></script>
-    <script src="app.js"></script>
   </head>
   <body></body>
+  <script type="module" src="main.js"></script>
 </html>