Fix HTML5 compatibility (#234)

- fixed date stamps to be HTML5 valid
- add `itemscope` to `<article>`

What I ommitted, but may need to fix later, if HTML5 hasn’t
included it yet:

- remove: `<meta name="copyright" content="{{ AUTHOR }}" />`

templates/archives.html

@@ -46,19 +46,19 @@ <h2 id="{{year }}"><a href="#{{year}}">{{ year }}</a></h2>
  {% endif %}
 
  {% if loop.last %}
- <article class="last-entry-of-year">
+ <article itemscope class="last-entry-of-year">
  {% else %}
  {% set next_year = loop.nextitem.date.strftime('%Y') %}
 
  {% if next_year != year %}
- <article class="last-entry-of-year">
+ <article itemscope class="last-entry-of-year">
  {% else %}
- <article>
+ <article itemscope>
  {% endif %}
  {% endif %}
 
  <a href="{{ SITEURL }}/{{ article.url }}">{{ article.title }} {%if article.subtitle %} <small> {{ article.subtitle }} </small> {% endif %} </a>
- <time pubdate="pubdate" datetime="{{ article.date.isoformat() }}">{{ article.locale_date }}</time>
+ <time itemprop="dateCreated" datetime="{{ article.date.isoformat() }}">{{ article.locale_date }}</time>
  </article>
  {% endfor %}
  </div>