website: Remove unused CSS file from statusbar example.

website/src/examples/statusbar/index.ejs

@@ -9,7 +9,6 @@ order: 5
 The StatusBar plugin shows detailed upload/processing progress with pause/resume/cancel buttons.
 {% endblockquote %}
 
-<link rel="stylesheet" href="app.css">
 <% include app.html %>
 <script src="app.js"></script>
 
@@ -28,8 +27,3 @@ The StatusBar plugin shows detailed upload/processing progress with pause/resume
   Along with this JavaScript:
 </p>
 {% include_code lang:js statusbar/app.es6 %}
-
-<p>
-  And the following CSS:
-</p>
-{% include_code lang:css statusbar/app.css %}