Change strips image example background to decrease load time

Author: jmuzina

templates/docs/examples/patterns/strips/image.html

@@ -4,7 +4,7 @@
 {% block standalone_css %}patterns_strip{% endblock %}
 
 {% block content %}
-<section class="p-strip--image is-light" style="background-image:url('https://assets.ubuntu.com/sites/ubuntu/latest/u/img/backgrounds/image-background-paper.png')">
+<section class="p-strip--image is-light" style="background-image:url('https://assets.ubuntu.com/v1/1d2ab6ba-suru-background.png')">
   <div class="row u-vertically-center">
     <div class="col-8">
       <h1>Get started with big software, fast</h1>