fix(docs): fix css ordering in storybook

[JoCa96]

Closes #2311

Vite doesn't consider the order of CSS includes/imports (See vitejs/vite#3924).
This causes issues for us in production, where we rely on the layer definitions to be defined first.

As a fix, we disable CSS code splitting: There isn't really a downside to this, it's a single, slightly bigger CSS file instead of many smaller ones.

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Latest commit: b76cc31

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[larsrickert]

This does not fix the issue for me...if you run "pnpm build:storybook && pnpm preview", the CSS layers are still broken