Update Quick Start link to new documentation path

Author: juntao

echokit_diy.html

@@ -768,7 +768,7 @@ <h1>EchoKit: Educational Voice AI Toolkit for Students and Builders</h1>
                     <a href="https://pay.x402labs.dev/echokit_diy" 
                        class="cta-button" 
                        onclick="trackInitiateCheckout(event)">Pay with USDC</a>
-                    <a href="/docs/quick-start" target="_blank" class="cta-button cta-secondary">Quick start</a>
+                    <a href="/docs/get-started/echokit-diy" target="_blank" class="cta-button cta-secondary">Quick start</a>
                 </div>
             </div>