Add page links section for mobile fix

Added page links section with navigation to various pages.

Author: yadinaclark

index.html

@@ -244,6 +244,29 @@ <h3 class="w3-border-bottom w3-border-light-grey w3-padding-16">Project Overview
 <!-- 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="pfas.html">About PFAS</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="aboutkgs.html">About KGs</a></p>
+      <p><a href="publications.html">Publications</a></p>
+    </div>
+
+    <div class="w3-col s12 m6 l4">
+      <p><a href="aboutus.html">Team</a></p>
+    </div>
+  </div>
+</div>
+  
 <!-- Page Footer -->
 <footer class="w3-center w3-black w3-padding-16">
   <p>Powered by <a href="https://www.w3schools.com/w3css/default.asp" title="W3.CSS" target="_blank" class="w3-hover-text-green">w3.css</a></p>