replace hub links with youtube embedded content

Author: burtenshaw

units/en/unit3/build-mcp-server.mdx

@@ -17,10 +17,7 @@ The team knows they need better PR descriptions, but everyone's too busy shippin
 
 ### Screencast: The PR Problem in Action 😬
 
-<video controls>
-  <source src="https://huggingface.co/datasets/mcp-course/videos/resolve/main/unit3/pr-chaos-at-cc-studios-small.mp4" type="video/mp4" />
-  Your browser does not support the video tag.
-</video>
+<Youtube id="tskAUPWFPP0" />
 
 **What You'll See**: A real PR at CodeCraft Studios titled "various improvements" and the description simply says "Fixed some stuff and made updates". Classic, right?
 
@@ -38,10 +35,7 @@ In this first module, you'll create the foundation of CodeCraft Studios' automat
 
 ### Screencast: Your PR Agent Saves the Day! 🚀
 
-<video controls>
-  <source src="https://huggingface.co/datasets/mcp-course/videos/resolve/main/unit3/better-prs-at-cc-studios.mp4" type="video/mp4" />
-  Your browser does not support the video tag.
-</video>
+<Youtube id="OaAWJLvnlqc" />
 
 **The Solution in Action**: Watch how your MCP server will transform PR chaos into clarity:
 1. **`analyze_file_changes`** - Grabs all the changes (453 lines across 8 files!)

units/en/unit3/github-actions-integration.mdx

@@ -26,10 +26,7 @@ Building on the foundation you created in Module 1, you'll add:
 
 ### Screencast: Real-Time CI/CD Monitoring in Action! 🎯
 
-<video controls>
-  <source src="https://huggingface.co/datasets/mcp-course/videos/resolve/main/unit3/github-actions-integration-compressed.mp4" type="video/mp4" />
-  Your browser does not support the video tag.
-</video>
+<Youtube id="XIEnmCicFXk" />
 
 **The Setup**: Watch how CodeCraft Studios' new system catches failures before they reach production:
 1. **GitHub Webhooks** - See the actual webhook configuration that sends events to your server

units/en/unit3/slack-notification.mdx

@@ -29,10 +29,7 @@ Building on the foundation from Modules 1 and 2, you'll add the final piece of t
 
 ### Screencast: The Complete Automation System! 🎉
 
-<video controls>
-  <source src="https://huggingface.co/datasets/mcp-course/videos/resolve/main/unit3/slack-notification-compressed.mp4" type="video/mp4" />
-  Your browser does not support the video tag.
-</video>
+<Youtube id="sX5qrbDG-oY" />
 
 **The Final Piece**: Watch how your complete automation system prevents those Monday morning surprises that plagued Emma and Jake!