update frontpage (#382)

* update ch03 img

* update build frontpage

* update frontpage

.github/workflows/update_docs.yml

@@ -2,10 +2,9 @@
 name: CI
 
 on:
-- pull_request:
+  pull_request:
     types:
       - closed
-- workflow_dispatch
 
 jobs:
   if_merged:

static/frontpage.html

@@ -227,7 +227,7 @@ a {
     <div class="author-item">
       <img src="./_images/jinxuefeng.png"/>
       <h3>金雪锋</h3>
-      <p> MindSpore首席架构师</p>
+      <p> MindSpore架构师</p>
     </div>
   </div>
   <div class = "mdl-cell mdl-cell--3-col mdl-cell--top">