Rename complete -> device-dashboard, remove multiple-logins and dashboard

examples/device-dashboard/web_root/index.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <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="style.css" />
+  </head>
+  <body></body>
+  <script type="module" src="main.js"></script>
+</html>