district & region: Article preview image size fixed

shared/templates/shared/article_preview.html

@@ -10,8 +10,13 @@
 
   <div class="article-card-cover">
     <a href="{{ article.url }}" itemprop="image" itemtype="http://schema.org/ImageObject" itemscope="">
-      {% image article.image width-2000 as img %}
-      <img src="{{ img.url }}" alt="{{ article.title }}">
+      {% image article.image fill-356x192 as img %}
+      {% image article.image fill-714x384 as img_2x %}
+      <img
+        src="{{ img.url }}"
+        srcset="{{ img.url }}, {{ img_2x.url }} 2x"
+        alt="{{ article.title }}"
+      >
       <meta itemprop="url" content="{{ img.url }}">
     </a>