Update footer to include Incubations

Replaces Model Loader.

Author: anssiko

_includes/footer.html

@@ -21,7 +21,7 @@
             <li><a class="footer_link underline" href="https://github.com/webmachinelearning/awesome-webnn">Awesome WebNN</a></li>
           </ul>
           <ul>
-            <li><a class="footer_link underline up" href="{{ 'model-loader-intro' | relative_url }}">Model Loader</a></li>
+            <li><a class="footer_link underline up" href="{{ 'incubations' | relative_url }}">Incubations</a></li>
           </ul>
           <ul>
             <li><a class="footer_link underline up" href="{{ 'community' | relative_url }}">Community</a></li>