Added estimated reading time and icon for the date

Signed-off-by: Jim Martens <github@2martens.de>

_layouts/post.html

@@ -6,11 +6,13 @@ layout: default
     <header class="post-header">
         <h1 class="post-title" itemprop="name headline">{{ page.title }}</h1>
         <p class="small text-muted">
+            <span class="far fa-calendar-alt"></span>
             <time datetime="{{ page.date | date_to_xmlschema }}" itemprop="datePublished">
                 {{ page.date | date: "%b %-d, %Y" }}
             </time>
             {% if page.author %} • <span itemprop="author" itemscope itemtype="http://schema.org/Person">
             <span itemprop="name">{{ page.author }}</span></span>{% endif %}
+            • {% include reading-time.html content=content %}
         </p>
     </header>