Add navigation links to About KGs page

Author: yadinaclark

aboutkgs.html

@@ -40,13 +40,34 @@ <h4 class="w3-border-bottom w3-border-light-grey w3-padding-16">Read more about
   </div>
 </div>
 
-
-
   <!-- End page content -->
 </div>
 
+<!-- Page Links -->
+<div class="w3-container w3-padding-32 w3-light-grey">
+  <h3 class="w3-border-bottom w3-border-light-grey w3-padding-16">Explore SAWGraph</h3>
+
+  <div class="w3-row-padding">
+    <div class="w3-col s12 m6 l4">
+      <p><a href="index.html">Home</a></p>
+      <p><a href="kg.html#project">Knowledge Graph</a></p>
+      <p><a href="kg.html#data-sources">Data Sources</a></p>
+    </div>
+
+    <div class="w3-col s12 m6 l4">
+      <p><a href="ontologies.html">Ontologies</a></p>
+      <p><a href="publications.html">Publications</a></p>
+      <p><a href="aboutus.html">Team</a></p>
+    </div>
+
+    <div class="w3-col s12 m6 l4">
+      <p><a href="pfas.html">About PFAS</a></p>
+      <p><a href="aboutkgs.html">About KGs</a></p>
+    </div>
+  </div>
+</div>
 
 <!-- Footer -->
 
 </body>
-</html>
+</html>