Add a bunch more blog stuff and templates

templates/blog-metadata.html

@@ -1,5 +1,9 @@
 <strong class="subtitle">
-  written: {{ page.date }}
+  written: {{ page.date | date(format="%Y-%m-%d at %l:%M:%S%p EST") }}
+  {%- if page.updated %}
+    <br>
+    modified: {{ page.updated | date(format="%Y-%m-%d at %l:%M:%S%p EST") }}
+  {%- endif -%}
   <br>
   authors: {%- for tag in page.taxonomies.authors | sort | unique(case_sensitive=false) %}
     <a class="post-author" href="{{ get_taxonomy_url(kind='authors', name=tag) | safe }}">{{ tag }}</a>