Update header.html

Author: jeroji

_includes/header.html

@@ -17,7 +17,7 @@
                 <ul class="navbar-nav">
                     <li class="nav-item"><a class="nav-link asociacion {% if page.url contains '/asociacion' %}active{% endif %}" href="{{ "/asociacion" | prepend: site.baseurl }}">Asociación</a></li>
                     <li class="nav-item"><a class="nav-link dojos {% if page.url contains '/dojos' %}active{% endif %}" href="{{ "/dojos" | prepend: site.baseurl }}">Dojos</a></li>
-                    <li class="nav-item"><a class="nav-link Desafío tech4ODS {% if page.url contains '/asociacion' %}active{% endif %}" href="{{ "https://sites.google.com/bylinedu.es/tech4ods/inicio" | prepend: site.baseurl }}">Desafío tech4ODS</a></li>
+                    <li class="nav-item"><a class="nav-link Desafío tech4ODS {% if page.url contains '/asociacion' %}active{% endif %}" href="{{ "https://sites.google.com/bylinedu.es/tech4ods/inicio" "_blank" | prepend: site.baseurl }}">Desafío tech4ODS</a></li>
                     <!--<li class="nav-item"><a class="nav-link noticias {% if page.url contains '/noticias' %}active{% endif %}" href="{{ "/noticias" | prepend: site.baseurl }}">Noticias</a></li>-->
                 </ul>
             </div>