[4.0.0-alpha8] Replace hardcoded use of not-prose class by boolean prop

.prose is currently on the page wrapper.

Components that are not prose, like ol/ul used in menus need to be overridden.

I think the best way to use tailwind typography in drupal is to set the .text-formatted class and use field--text.html and related templates from starterkit theme which attaches it to the right fields. Or use that template with .prose.

I'd rather set the style where needed than set it globally and have to unset it on component elements.