[examples] Update webpack example

[hauxir]

I'm currently using webpack in combination with esbuild-loader, and have been relying on the @stylexjs/webpack-plugin for Stylex integration.
Since this plugin is now deprecated, what is the recommended replacement or migration path?

[hauxir]

anyone?

[necolas]

You can use the postcss plugin - https://stylexjs.com/docs/learn/installation/

[necolas]

I renamed this issue because we still need to update the webpack example to use an officially supported solution.