Update the webpage (#1421)

* Re-generate the files with `tools/update-webpage.sh`
 * Add the document about reference counting
 * Introduce a drop down list for documents

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com

_includes/header.html

@@ -22,13 +22,26 @@
       <ul class="nav navbar-nav navbar-right">
         {% for p in site.pages %}
           {% if p.title %}
-            {% if page.url == p.url %}
-              <li class="active"><a href="{{ p.url | prepend: site.github.url }}" >{{ p.title }}</a></li>
-            {% else %}
-              <li><a href="{{ p.url | prepend: site.github.url }}" >{{ p.title }}</a></li>
+            {% if p.url != "/internals/" and p.url != "/port-api/" and p.url != "/reference-counting/" %}
+              {% if page.url == p.url %}
+                <li class="active"><a href="{{ p.url | prepend: site.github.url }}" >{{ p.title }}</a></li>
+              {% else %}
+                <li><a href="{{ p.url | prepend: site.github.url }}" >{{ p.title }}</a></li>
+              {% endif %}
             {% endif %}
           {% endif %}
         {% endfor %}
+        <li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Documents <span class="caret"></span></a>
+          <ul class="dropdown-menu">
+            {% for p in site.pages %}
+              {% if p.title %}
+                {% if p.url == "/internals/" or p.url == "/port-api/" or p.url == "/reference-counting/" %}
+                  <li><a href="{{ p.url | prepend: site.github.url }}" >{{ p.title }}</a></li>
+                {% endif %}
+              {% endif %}
+            {% endfor %}
+          </ul>
+        </li>
       </ul>
     </div><!--/.nav-collapse -->
   </div>