Update index.md

en_us/index.md

@@ -5,7 +5,7 @@
 
 VNote 2.8 is released! Check out [what's new](https://github.com/tamlok/vnote/releases)!
 
-Check this [showcase screencast](https://www.bilibili.com/video/av77455284) to know what you could do with VNote!
+Check this [showcase screencast](https://www.youtube.com/watch?v=EFCmCFZKxJ4) to know what you could do with VNote!
 
 :::