Update html template, add markdown template.

templates/article.html

@@ -7,12 +7,12 @@
   {% if title %}
   <h2>{{ title }}</h2>
   {% endif %}
+  {% if description %}
+  <p>{{ description }}</p>
+  {% endif %}
 
   <aside>
-    <p>published on {{ date.date() }}
-
-    {% if tags %}
-    · tagged with
+    <p>{% if tags %} tagged with
       {% for tag in tags|sort(case_sensitive=true) %}
         {%- if not loop.first and not loop.last %}, {% endif -%}
         {%- if loop.last and not loop.first %} and {% endif %}
@@ -20,6 +20,8 @@
       {%- endfor %}
     {% endif %}
     </p>
+    <p>published on {{ date.date() }} </p>
+    <p>{%- if edited %} edited on {{ edited }}{% endif -%}</p>
   </aside>
 
   {{ content }}