add deepstream example

Author: yyx990803

src/v2/examples/deepstream.md

@@ -0,0 +1,9 @@
+---
+title: Realtime with deepstreamHub
+type: examples
+order: 9
+---
+
+> This example uses [deepstreamHub](https://deepstreamhub.com/) to synchronize realtime data, send events and make remote procedure calls between clients (you can try opening it in multiple browser windows).
+
+<iframe width="100%" height="500" src="https://jsfiddle.net/yyx990803/ff0sp9hw/embedded/result,html,js,css" allowfullscreen="allowfullscreen" frameborder="0"></iframe>

src/v2/examples/firebase.md

@@ -1,7 +1,7 @@
 ---
 title: Firebase + Validation
 type: examples
-order: 2
+order: 10
 ---
 
 > This example uses [Firebase](https://firebase.google.com/) as the data persistence backend and syncs between clients in real time (you can try opening it in multiple browser tabs). In addition, it performs instant validation using computed properties and triggers CSS transitions when adding/removing items.

src/v2/examples/hackernews.md

@@ -1,7 +1,7 @@
 ---
 title: HackerNews Clone
 type: examples
-order: 10
+order: 12
 ---
 
 > This is a HackerNews clone built upon HN's official Firebase API, Vue 2.0 + vue-router + vuex, with server-side rendering.

src/v2/examples/todomvc.md

@@ -1,7 +1,7 @@
 ---
 title: TodoMVC
 type: examples
-order: 9
+order: 11
 ---
 
 > This is a fully spec-compliant TodoMVC implementation in under 120 effective lines of JavaScript (excluding comments and blank lines).