docs: Remove security documentation from README.md (#15511)

* docs: Remove outdated security documentation from README.md

Removed the entire security documentation due to it having broken links that also caused linting issue #15508

* fix: update yarn.lock file

Author: mrkushalsm

README.md

@@ -58,10 +58,6 @@ Search the [existing issues](https://github.com/microsoft/react-native-windows/i
 ## Documentation
 React Native has [great documentation](https://reactnative.dev/docs/getting-started). React Native for Windows adds its own separate [Windows and macOS documentation](https://microsoft.github.io/react-native-windows/) for desktop platform information like API docs and blog updates.
 
-### Security Documentation
-- **[Security Configuration Guide](https://github.com/microsoft/react-native-windows/blob/main/docs/security-configuration.md)** - Comprehensive guide for SDL-compliant security configurations
-- **[Security Best Practices](https://github.com/microsoft/react-native-windows/blob/main/docs/security-best-practices.md)** - Secure coding patterns and security API usage
-
 ### Examples
 - Using the CLI in the [Getting Started](https://microsoft.github.io/react-native-windows/docs/getting-started) guide will set you up with a sample React Native for Windows app that you can begin editing right away.
 - Check the [samples repo](https://github.com/microsoft/react-native-windows-samples) for more standalone samples.