add link to array api on footer

Author: leofang

layouts/partials/footer.html

@@ -5,6 +5,9 @@
         <li>
           <a href="/blog/">Blog</a>
         </li>
+        <li>
+          <a href="https://data-apis.org/array-api/latest/">Array API</a>
+        </li>
         <li>
           <a href="https://github.com/data-apis">GitHub</a>
         </li>
@@ -17,4 +20,4 @@
       </ul>
     </nav>
     <p>&copy Consortium Members; Licence MIT.</p>
-  </footer>
+  </footer>