Updated date formatting

ref DES-937

- updated the format to DD MMM YYYY which is the preferred format in Ghost

post.hbs

@@ -14,7 +14,7 @@
                     <a class="gh-article-tag" href="{{primary_tag.url}}">{{primary_tag.name}}</a>
                 {{/if}}
                 —
-                <time datetime="{{date format="YYYY-MM-DD"}}">{{date}}</time>
+                <time datetime="{{date format="YYYY-MM-DD"}}">{{date format="DD MMM YYYY"}}</time>
             </span>
 
             <h1 class="gh-article-title">{{title}}</h1>