Update video demonstration in README

Removed video tag from README and added video link.

Author: Harahan

README.md

@@ -147,9 +147,7 @@ The following video demonstrates the quality improvement achieved by GenRL train
 
 <div align="center">
 
-<video src="https://github.com/user-attachments/assets/074d4b77-67b9-475f-a0c4-beb1f5168890" controls loop autoplay muted style="max-width: 100%; height: auto;">
-  Your browser does not support the video tag.
-</video>
+https://github.com/user-attachments/assets/074d4b77-67b9-475f-a0c4-beb1f5168890
 
 </div>