Add nspanelmanager project to list (#551)

Author: sebastienvermeille

index.html

@@ -293,6 +293,12 @@ <h2 id="used-by">Products using ESP Web Tools</h2>
           </div>
           <div class="name">TRMNL</div>
         </a>
+        <a href="https://nspanelmanager.com" target="_blank" class="project">
+          <div class="logo">
+            <img src="static/logos/nspanelmanager.svg" alt="NSPanelManager logo" />
+          </div>
+          <div class="name">NSPanel Manager</div>
+        </a>
       </div>
 
       <h2>How it works</h2>