docs: add showcase video

docs/start/showcase.md

@@ -60,6 +60,28 @@ Full setup walkthrough (28m) by VelvetShark.
 
 [Watch on YouTube](https://www.youtube.com/watch?v=mMSKQvlmFuQ)
 
+<div
+  style={{
+    position: "relative",
+    paddingBottom: "56.25%",
+    height: 0,
+    overflow: "hidden",
+    borderRadius: 16,
+  }}
+>
+  <iframe
+    src="https://www.youtube-nocookie.com/embed/5kkIJNUGFho"
+    title="Clawdbot community showcase"
+    style={{ position: "absolute", top: 0, left: 0, width: "100%", height: "100%" }}
+    frameBorder="0"
+    loading="lazy"
+    allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
+    allowFullScreen
+  />
+</div>
+
+[Watch on YouTube](https://www.youtube.com/watch?v=5kkIJNUGFho)
+
 ## 🆕 Fresh from Discord
 
 <CardGroup cols={2}>