🎨 Optimised infinite scroll (#503)

no issue
- removed jQuery usage
- use the `<link rel="next">` tag provided by Ghost to determine the next page to fetch

default.hbs

@@ -76,12 +76,6 @@
     <script type="text/javascript" src="{{asset "built/jquery.fitvids.js"}}"></script>
 
     {{#if pagination.pages}}
-    <script>
-        // maxPages is a global variable that is needed to determine
-        // if we need to load more pages for the infinitescroll, or if
-        // we reached the last page already.
-        var maxPages = parseInt('{{pagination.pages}}');
-    </script>
     <script src="{{asset "built/infinitescroll.js"}}"></script>
     {{/if}}