Add embedded YouTube short player for XML-RPC guide

blog/posts/odoo-xml-rpc-hermes-agent.html

@@ -77,15 +77,17 @@
         </p>
 
         <p>
-            I made a <strong>YouTube short</strong> walking through this exact setup — you can watch it here:
+            I made a <strong>YouTube short</strong> walking through this exact setup:
         </p>
 
-        <div style="text-align:center;margin:24px 0">
-            <a href="https://youtube.com/shorts/" style="display:inline-block;background:#ff4444;color:#fff;padding:12px 32px;border-radius:10px;font-weight:600;font-size:1rem;" target="_blank" rel="noopener">
-                ▶ Watch the Short on YouTube
-            </a>
+        <div style="position:relative;width:100%;max-width:360px;margin:24px auto;aspect-ratio:9/16;border-radius:14px;overflow:hidden;background:#000">
+            <iframe src="https://www.youtube.com/embed/GVZMnq_NOxI" title="Odoo + AI Agent in 3 Minutes (XML-RPC)" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen style="position:absolute;top:0;left:0;width:100%;height:100%"></iframe>
         </div>
 
+        <p style="text-align:center;font-size:0.85rem;color:#888;margin-top:-12px">
+            <a href="https://www.youtube.com/shorts/GVZMnq_NOxI?utm_source=derez&utm_campaign=email" target="_blank" rel="noopener" style="color:#ff4444">Watch on YouTube →</a>
+        </p>
+
         <h2>What you'll build</h2>
         <p>By the end of this guide, your Hermes Agent will:</p>
         <ul>