Add link to Doctrine homepage to docs layout template.

en/_templates/layout.html

@@ -18,6 +18,7 @@
           {%- if not loop.first %}{{ reldelim2 }}{% endif %}</li>
         {%- endfor %}
         {%- block rootrellink %}
+        <li><a href="http://www.doctrine-project.org">Doctrine Homepage</a> &raquo;</li>
         <li><a href="{{ pathto(master_doc) }}">{{ shorttitle|e }}</a>{{ reldelim1 }}</li>
         {%- endblock %}
         {%- for parent in parents %}