Update header-navigation.html

Author: insectengine

_includes/header-navigation.html

@@ -17,6 +17,7 @@
           <li><a href="{{site.baseurl}}/container-first" class="{% if page.url contains '/container-first/' %}active{% endif %}">CONTAINER FIRST</a></li>
           <li><a href="{{site.baseurl}}/continuum" class="{% if page.url contains '/continuum/' %}active{% endif %}">REACTIVE</a></li>
           <li><a href="{{site.baseurl}}/developer-joy" class="{% if page.url contains '/developer-joy/' %}active{% endif %}">DEVELOPER JOY</a></li>
+          <li><a href="{{site.baseurl}}/performance" class="{% if page.url contains '/performance/' %}active{% endif %}">PERFORMANCE</a></li>
           <li><a href="{{site.baseurl}}/kubernetes-native" class="{% if page.url contains '/kubernetes-native/' %}active{% endif %}">KUBERNETES NATIVE</a></li>
           <li><a href="{{site.baseurl}}/standards" class="{% if page.url contains '/standards/' %}active{% endif %}">STANDARDS</a></li>
         </ul>