Add description to article and blog post headers

src/_includes/global/content.njk

@@ -17,6 +17,7 @@
 
     {% if isArticle %}
         <div class="article__info">
+            <p class="article__info--desc">{{ desc }}</p>
             <p>Posted on {{ date | formatDate }} by {{ sitemeta.siteAuthor.name }}
             {% if updated %}
                 • Last updated on {{ updated | formatDate }}</p>
@@ -102,6 +103,8 @@
         padding-left: 0.3em;
     }
 
+    .article__info--desc { margin-bottom: 1em; }
+
     .blog__post--pagination {
         padding-top: 1em;
         margin-top: 2.5em;