made some fixes in the docs and to the relative links with posts and news pages

pages/news/news_archive.html

@@ -26,7 +26,7 @@ folder: news
         <ul class="past">
             {% endif %}
             {% endunless %}
-            <li><time>{{ post.date | date:"%d %b" }}</time><a href="{{ post.url | prepend: site.baseurl }}">{{ post.title }}</a></li>
+            <li><time>{{ post.date | date:"%d %b" }}</time><a href="{{ post.url }}">{{ post.title }}</a></li>
             {% endfor %}
         </ul>
     </section>