merged upwards example to articles example

Author: fieg

examples/articles/index.js

@@ -3,6 +3,7 @@ import InfiniteAjaxScroll from '@webcreate/infinite-ajax-scroll';
 window.ias = new InfiniteAjaxScroll('.surface-container', {
   item: '.article',
   next: '.pager__next',
+  prev: '.pager__prev',
   pagination: '.pager',
   spinner: '.loader'
 });