Add YouTube video tutorial to CLI documentation (#9351)

Co-authored-by: openhands <openhands@all-hands.dev>

docs/usage/cloud/slack-installation.mdx

@@ -3,6 +3,15 @@ title: Slack Integration (Beta)
 description: This guide walks you through installing the OpenHands Slack app.
 ---
 
+<iframe
+  className="w-full aspect-video"
+  src="https://www.youtube.com/embed/hbloGmfZsJ4"
+  title="OpenHands Slack Integration Tutorial"
+  frameBorder="0"
+  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
+  allowFullScreen>
+</iframe>
+
 ## Prerequisites
 
 - Access to OpenHands Cloud.

docs/usage/how-to/cli-mode.mdx

@@ -7,6 +7,15 @@ description: The Command-Line Interface (CLI) provides a powerful interface that
 This mode is different from the [headless mode](/usage/how-to/headless-mode), which is non-interactive and better
 for scripting.
 
+<iframe
+  className="w-full aspect-video"
+  src="https://www.youtube.com/embed/PfvIx4y8h7w"
+  title="OpenHands CLI Tutorial"
+  frameBorder="0"
+  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
+  allowFullScreen>
+</iframe>
+
 ## Getting Started
 
 ### Running with Python