Merge branch 'feature/ISTWCMS-4531-ebremner-remove-theme-dashboard' into '8.x-3.x'

css/styles.css

js/component_scripts.min.js

source/_patterns/00-config/_design-tokens.artifact.scss

...e/_patterns/02-base/02-html-elements/25-forms/_forms.scss

source/_patterns/03-layouts/content/_content.scss

source/_patterns/03-layouts/content/content.twig

...ponents/00-cms-styles/layout-builder/_layout-builder.scss

...s/04-components/menu/menu--horizontal/menu--horizontal.js