fix(card): regressions heading et erreurs docs

CHANGELOG.md

...omponents/src/lib/components/card/base-panel.component.ts

...fr-components/src/lib/components/card/card.component.html

...dsfr-components/src/lib/components/card/card.component.ts

...ects/ngx-dsfr-components/src/lib/components/card/card.mdx

.../ngx-dsfr-components/src/lib/components/card/card.spec.ts

...fr-components/src/lib/components/tile/tile.component.html

...ects/ngx-dsfr-components/src/lib/components/tile/tile.mdx

...x-dsfr-components/src/lib/components/tile/tile.stories.ts