🎨 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

assets/built/infinitescroll.js

@@ -1,2 +1,2 @@
-$(function(t){var o=1,r=window.location.pathname,a=t(document),s=t(".post-feed"),c=300,l=!1,w=!1,d=window.scrollY,v=window.innerHeight,u=a.height();function f(){d=window.scrollY,e()}function g(){v=window.innerHeight,u=a.height(),e()}function e(){l||requestAnimationFrame(n),l=!0}function n(){var e,n;if(n=/(?:page\/)(\d)(?:\/)$/i,(e=(e=r).replace(/#(.*)$/g,"").replace("////g","/")).match(n)&&(o=parseInt(e.match(n)[1]),e=e.replace(n,"")),r=e,!w)if(d+v<=u-c)l=!1;else{if(o>=maxPages)return window.removeEventListener("scroll",f,{passive:!0}),void window.removeEventListener("resize",g);w=!0;var i=r+"page/"+(o+=1)+"/";t.get(i,function(e){var n=document.createRange().createContextualFragment(e).querySelectorAll(".post");n.length&&[].forEach.call(n,function(e){s[0].appendChild(e)})}).fail(function(e){404===e.status&&(window.removeEventListener("scroll",f,{passive:!0}),window.removeEventListener("resize",g))}).always(function(){u=a.height(),l=w=!1})}}window.addEventListener("scroll",f,{passive:!0}),window.addEventListener("resize",g),n()});
+!function(n,t){var r=t.querySelector("link[rel=next]");if(r){var i=t.querySelector(".post-feed");if(i){var o=300,s=!1,l=!1,c=n.scrollY,u=n.innerHeight,d=t.documentElement.scrollHeight;n.addEventListener("scroll",a,{passive:!0}),n.addEventListener("resize",m),f()}}function v(){if(404===this.status)return n.removeEventListener("scroll",a),void n.removeEventListener("resize",m);this.response.querySelectorAll(".post-card").forEach(function(e){i.appendChild(e)});var e=this.response.querySelector("link[rel=next]");e?r.href=e.href:(n.removeEventListener("scroll",a),n.removeEventListener("resize",m)),d=t.documentElement.scrollHeight,l=s=!1}function e(){if(!l)if(c+u<=d-o)s=!1;else{l=!0;var e=new n.XMLHttpRequest;e.responseType="document",e.addEventListener("load",v),e.open("GET",r.href),e.send(null)}}function f(){s||n.requestAnimationFrame(e),s=!0}function a(){c=n.scrollY,f()}function m(){u=n.innerHeight,d=t.documentElement.scrollHeight,f()}}(window,document);
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