post-item.html.twig

<div class="post-list">
  <div class="post-list--data">
	  <div class="post-image">
	  {% set blog_image= page.media.images|first %}
	  <img src="$blog_image.url" alt=""/>
	  </div>
      <a href="{{ post.url }}"><h1 class="dark">{{ post.title }}</h1></a>
      <a href="{{ post.url }}">by {{ page.header.author }} - <date>{{ post.date|nicetime(true) }}</date></a>
      <p>{{ post.summary }}</p><a href="{{ post.url }}"><span class="read-more">Read more...</span></a>
  </div>
</div>