add architecture overview

Author: kschweikert

images/SAWGraphOverview-Jan2025.png

@@ -153,10 +153,17 @@ <h4 class="w3-border-bottom w3-border-light-grey w3-padding-16">Read more about
 </div>
 
   <!-- Project Summary (Datasheet) -->
+
 <div class="w3-container" id="project">
+  <div class="w3-container w3-padding-32">
+    <h3 class="w3-border-bottom w3-border-light-grey w3-padding-16">Architecture</h3>
+    <p>The SAWGraph Knowledge Graph provides a comprehensive view of PFAS contamination, potential sources, and potential impacts. These are organized into a series of interconnected knowledge graphs to facilitate reuse and modularize the large graphs.</p>
+    <img src="images/SAWGraphOverview-Jan2025.png" style="width:100%;max-width:1000px" class="w3-margin-top">
+  </div>
+<div class="w3-container" >
   <div class="w3-container w3-padding-32">
     <h4 class="w3-border-bottom w3-border-light-grey w3-padding-16">Source data</h4>
-
+    <p> SAWGraph integrates data from multiple federal and state sources. The primary data sources include:</p>
     <table class="w3-table-all" "w3-card-4">
       <thead><tr>
         <tr style="height: 30px">