Create Danger rule to warn about adding new page specific CSS

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Based on the work we do in &950 (closed) for improving our CSS setup we really want to highlight and warn engineers if they are adding new page specific CSS that this might not be the best way.

So most probably its not feasible to throw an error as there still might be a topic why we need to add page specific CSS but at least we should warn and make people rethink their implementation.