Start implementing post info at bottom

Now, all posts show info about: author, updated date, tags.
However, styling is needed and also the tags part has to be fixed (we need to add a comma after every tag's name, excluding the last one)

post.hbs

@@ -5,7 +5,7 @@
         <div>
             <h1>{{title}}</h1>
             <p><a class="mind-post-header_tag" href="{{primary_tag.url}}">{{primary_tag.name}}</a> •
-                <time class="post-date" datetime="{{date format='YYYY-MM-DD'}}">{{date format="DD MMMM YYYY"}}</time>
+                <time class="post-date" datetime="{{date published_at format='YYYY-MM-DD'}}">{{date published_at format="DD MMMM YYYY"}}</time>
             </p>
         </div>
     {{/post}}
@@ -40,6 +40,19 @@
                         </div>
                         {{content}}
                         <hr>
+                        <i>Last update: <time class="post-date" datetime="{{date updated_at format='YYYY-MM-DD'}}">{{date updated_at format="DD MMMM YYYY"}}</time></i>
+                        <br />
+                        <i>Author: {{primary_author.name}}</i>
+
+                        {{#if tags}}
+                            <br />
+                            <i>Tags:
+                                {{#foreach tags}} {{!-- TODO: NOT WORKING --}}
+                                <a href="{{url}}" title="{{name}}" class="tag tag-{{id}} {{slug}}">{{name}}</a>
+                                {{/foreach}}
+                            {{/if}}
+                        </i>
+                        <hr>
                     </div>
                     <h3>Comments</h3>
                     <div id="remark42"></div>