Adding the event teaser and the ability to select the datetime format per card-teaser

css/styles.css

source/_patterns/02-base/date-formats/long-datetime.twig

..._patterns/02-base/date-formats/medium-date-short-month.md

...atterns/02-base/date-formats/medium-date-short-month.twig

source/_patterns/04-components/card/card.md

source/_patterns/04-components/card/card.twig

source/_patterns/04-components/card/card.yml

...erns/04-components/teaser/teaser--blog/_teaser--blog.scss

...atterns/04-components/teaser/teaser--blog/teaser--blog.md

...terns/04-components/teaser/teaser--blog/teaser--blog.twig

...tterns/04-components/teaser/teaser--blog/teaser--blog.yml

...ns/04-components/teaser/teaser--event/_teaser--event.scss

...terns/04-components/teaser/teaser--event/teaser--event.md

...rns/04-components/teaser/teaser--event/teaser--event.twig

...erns/04-components/teaser/teaser--event/teaser--event.yml

source/_patterns/04-components/teaser/teaser.md

source/_patterns/04-components/teaser/teaser.twig

source/_patterns/04-components/teaser/teaser.yml