Add full date on each post

Close #2

_includes/single-post.html

@@ -13,7 +13,7 @@
               <span>
                 <a href="{{ post.link }}">{{ post.author }}</a>
                 <span class="text-muted">posted at</span>
-                <a class="text-muted" href="{{ post.original_link }}">{{ post.created_at | date: "%H:%M" }} </a>
+                <a class="text-muted" href="{{ post.original_link }}">{{ post.created_at | date: "%-d %B %Y %H:%M" }} </a>
                 {% if post.irc %}
                   <span class="badge badge-dark"><img src="{{ site.baseurl }}/images/profile/irc.svg"/> {{ post.irc }}</span>
                 {% endif %}