Fix opto image

Author: knolleary

index.html

@@ -126,7 +126,7 @@ <h3>Who's using Node-RED?</h3>
             <li><a href="/users/go-iot"><img src="users/go-iot/Logo-large.png"/></a></li>
             <li><a href="/users/spiritai"><img src="users/spiritai/spiritai.png"/></a></li>
             <li><a href="/users/multitech"><img src="users/multitech/multitech.png"/></a></li>
-            <li><a href="/users/opto22"><img src="users/opto22/opto22.png"/></a></li>
+            <li><a href="/users/opto22"><img src="users/opto22/images/opto22.png"/></a></li>
             <li><a href="/users/iaconnects"><img src="users/iaconnects/iaconnects.png"/></a></li>
             </ul>
             <p style="text-align:center;"><a href="/about/community/">Want to feature here? Let us know!</a></p>