Add comment explaining why we're deleting exercise_perseus_renderer manually.
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aronasorman/kolibri,lyw07/kolibri,mrpau/kolibri,indirectlylit/kolibri,jonboiser/kolibri,jonboiser/kolibri,mrpau/kolibri,aronasorman/kolibri,indirectlylit/kolibri,MingDai/kolibri,benjaoming/kolibri,mrpau/kolibri,DXCanas/kolibri,learningequality/kolibri,christianmemije/kolibri,rtibbles/kolibri,benjaoming/kolibri,lyw07/kolibri,lyw07/kolibri,DXCanas/kolibri,learningequality/kolibri,MingDai/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,learningequality/kolibri,DXCanas/kolibri,jonboiser/kolibri,rtibbles/kolibri,christianmemije/kolibri,learningequality/kolibri,aronasorman/kolibri,MingDai/kolibri,jonboiser/kolibri,rtibbles/kolibri,benjaoming/kolibri,benjaoming/kolibri,christianmemije/kolibri,rtibbles/kolibri,lyw07/kolibri,mrpau/kolibri,christianmemije/kolibri,MingDai/kolibri,DXCanas/kolibri,aronasorman/kolibri