docs(vite): assert css-bundle removal

[markdalgleish]

I'm still seeing usage of the css-bundle package in Remix + Vite repos in the wild. The docs suggest that removing the css-bundle package is optional, but this is leftover from when we placed more emphasis on allowing Vite-based Remix projects to be backwards compatible with the esbuild compiler. However, the docs are now written much more assertively in the direction of removing anything Vite doesn't use or support. This PR updates the css-bundle section to be more in line with the rest of the docs.

[changeset-bot]

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