chore: update sponsors

Author: kamilmysliwiec

index.html

@@ -343,6 +343,9 @@ <h5>Principal sponsors</h5>
           <a href="https://valor-software.com/" target="_blank">
             <img src="img/valor-software.png" class="principal-logo" />
           </a>
+          <a href="https://amplication.com/" target="_blank">
+            <img src="img/amplication-logo.svg" class="principal-logo" />
+          </a>
         </div>
         <div class="support-section">
           <h5>Gold sponsors</h5>