codeasashu#5 Solve a problem with URL reference of category

Solve a little problem commented in the issue codeasashu#5 about the missmatch reference between 127.0.0.1 and the real DNS URL.

_layouts/posts_by_category.html

@@ -41,7 +41,7 @@ <h1 id="post-subtitle">Articles by category: <em class="text-muted">{{ page.cate
                 {% endif %}
             {% endif %}
             <div class="least-content">{{ post.date | date_to_string }}</div>
-            <h4 class="list-group-item-heading"><a href="{{ site.baseurl }}/{{ post.url }}">{{ post.title }}</a></h4>
+            <h4 class="list-group-item-heading"><a href="{{ site.baseurl }}{{ post.url }}">{{ post.title }}</a></h4>
             <p class="list-group-item-text">{{ post.content | strip_html | truncatewords: 20 }}</p>
 
             </div>