add target architecture diagram

opsec/anonymous_server_monitoring/index.html

@@ -199,7 +199,7 @@
                         <h1><b>Target Architecture</b></h1>
                         First, let's have a look at the network topology we'll be building:
                         <br>
-                        <img src="target_network_arch.png"/>
+                        <img src="architecture.png"/>
                     </p>
           
 	       </div>