feat(summary): possibilité d'avoir des sous-niveaux + routerLink

CHANGELOG.md

...s/ngx-dsfr-components/src/lib/components/summary/index.ts

...ponents/src/lib/components/summary/summary.component.html

...omponents/src/lib/components/summary/summary.component.ts

...gx-dsfr-components/src/lib/components/summary/summary.mdx

...fr-components/src/lib/components/summary/summary.model.ts

...r-components/src/lib/components/summary/summary.module.ts

...-components/src/lib/components/summary/summary.stories.ts