Remove unused legacy sources
Remove unused legacy sources

This CSS doesn't target any elements in our repos so remove it.

kalleth/static,robinwhittleton/static,robinwhittleton/static,alphagov/static,kalleth/static,tadast/static,tadast/static,robinwhittleton/static,kalleth/static,tadast/static,kalleth/static,tadast/static,alphagov/static,robinwhittleton/static,alphagov/static