Add meta viewport tag

This will show the UI correctly in small screens.

Change-Id: I86356079fd096cbdc7b06a32340efa56797f72cb
diff --git a/frontend/index.html b/frontend/index.html
index 3184bf9..3c70b90 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -3,6 +3,7 @@
   <head>
     <meta charset="utf-8">
     <title>TWPT Dashboard</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
     <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
     <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500">
     <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto+Mono:300,400,500">