https://help.disqus.com/en/articles/1717274-adding-comment-count-links-to-your-home-page
<script id="dsq-count-scr" src="//EXAMPLE.disqus.com/count.js" async></script>
<span class="disqus-comment-count" data-disqus-url="http://example.com/article1.html">First article</span>