Issue #3421069: Fix styling of Hero Card content and the Heroslider controls and indicators

components/organisms/card-hero/card-hero.css

components/organisms/card-hero/card-hero.scss

components/organisms/heroslider/README.md

components/organisms/heroslider/heroslider.component.yml

components/organisms/heroslider/heroslider.css

components/organisms/heroslider/heroslider.mdx

components/organisms/heroslider/heroslider.scss

components/organisms/heroslider/heroslider.twig