Syntaxis changes and color fix

[turtlemoji]

Proposed changes:

• Modify the theme export from dark to something more specific and camelcase, like DarkThemeColors or etc.
• the dark theme has a wrong color (extra character)
• Modify kebab case to camelcase in color vars, like, primary-variant would be primaryVariant. This is since when used, if it is kebab case, you should have to do dark.colors['primary-variant'] instead of just dark.colors.primaryVariant. And would look inconsistent since with small ones like primary, it will indeed be dark.colors.primary.