fix(assets) Use HTTPS to load Prism.js library.

Since Prism.js is used on others pages, we just updated the link to point the the static.hoa-project.net version.

Author: shulard

Source/Overlays/Article.xyl

@@ -23,7 +23,7 @@
   </article>
 
   <yield id="scripts">
-    <script src="http://prismjs.com/prism.js"></script>
+    <script src="https://static.hoa-project.net/Javascript/Prism.js"></script>
 
     <script type="text/javascript">
       DiscourseEmbed = {