fix - Use mp4 for better visual (#1121)

Author: jdneo

com.microsoft.copilot.eclipse.ui/intro/whatsnew/0.11.0/api.mp4

@@ -5,11 +5,11 @@ You now have multiple ways to include context files:
 
 #### Drag and Drop
 
-![Drag and Drop](./0.11.0/dnd_1.gif)
+<video controls src="./0.11.0/dnd.mp4" title="Drag and Drop"></video>
 
 #### Right-Click from Explorer
 
-![Right-Click from Explorer](./0.11.0/context_menu_1.gif)
+<video controls src="./0.11.0/context_menu.mp4" title="Right-Click from Explorer"></video>
 
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@@ -44,7 +44,7 @@ This opens up exciting possibilities for plugin developers to trigger contextual
 
 Here’s how the Spring Tools plug-in leverages the new API to launch a chat session:
 
-![STS Integration](./0.11.0/api_1.gif)
+<video controls src="./0.11.0/api.mp4" title="Spring Tools Plug-in Integration"></video>
 
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