docs(README): remove migration guide link (#5828)

Author: Lukas742

README.md

@@ -35,7 +35,6 @@ You can find our documentation under the following links:
 
 - [Stable Release Documentation](https://sap.github.io/ui5-webcomponents-react/)
 - [Next Release Documentation](https://sap.github.io/ui5-webcomponents-react/main/)
-- [Migration Guide](https://sap.github.io/ui5-webcomponents-react/?path=/docs/migration-guide--page)
 
 ## Package Overview