Dark mode improvements

[mgrsskls]

• Dark mode makes most sense when the project also supports dark mode
• If the project does not support dark mode, how to deal with the color design tokens for example?
• Possibility to disable dark mode to avoid issues?
• Do we need to somehow differentiate between dark mode for miyagi and the project? Put miyagi into dark mode, but keep the project "bright"? Just brainstorming here…