Docs theme updates (#2971)

* Update architecture diagram and theme colors

* Update state and proxy diagrams

docs/index.html

@@ -74,7 +74,7 @@ SPDX-License-Identifier: EPL-2.0
 <style>
 
   body, input {
-      background-color: #f0eeea;
+      background-color: #F0EEEA;
   }
 
   .sidebar-sep {
@@ -96,6 +96,22 @@ SPDX-License-Identifier: EPL-2.0
       font-weight: 700;
   }
 
+  thead tr {
+      background-color: #015585;
+      color: #f0eeea;
+  }
+  tbody tr:nth-child(odd) {
+      background-color: #9abfdf;
+  }
+
+  tbody tr:nth-child(even) {
+      background-color: #ffffff;
+  }
+
+  .markdown-section code,.markdown-section pre {
+      background-color: #f8f8f8;
+  }
+
 </style>
     
 <style>