docs: update README with security note for code execution setup

Author: rui-typelets

README.md

@@ -81,7 +81,7 @@ Get the native desktop experience with:
 
 ### ⚡ Executable Code Blocks
 
-![Execute Code Demo](https://github.com/typelets/typelets-app/blob/main/execute-code-demo.gif)
+![Execute Code Demo](https://github.com/typelets/typelets-app/blob/main/assets/execute-code-demo.gif)
 
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