wip(dossier_created_hook): add tile to administrateurs/procedure#show in order to crud dossier_created_hook
refactor(css.utilities): remove merge helpers.scss within utils.scss (same purpose). use scss each for spacer modifiers
refactor(dossiers/_merci.html): extract partial _merci so we can re-use it in preview of dossier_created_hook.
feat(wip): current progress