added srcset to article cards

layouts/partials/article-card.html

@@ -1,7 +1,7 @@
 <article class="shadow float-on-hover card">
 	<div class="article-image">
 		<a href=" {{ .Permalink }}">
-		<img class="fill-wh" src="{{ .Params.featured.url }}" alt="{{ .Params.featured.alt }}"/></a>
+		<img class="fill-wh" src="{{ .Params.featured.url }}" srcset="{{ .Params.featured.srcset }}" alt="{{ .Params.featured.alt }}"/></a>
 	</div>
 	<div class="article-info-container">
 		<div class="article-info">