feat: button styles for different action types

[schalkneethling]

Is your feature request related to a problem? Please describe.
I expected there to be at least a critical button style. Thinking about it, perhaps that is the only one that should be provided by Minimalist.

Describe the solution you'd like
Add a .critical class for buttons that will set the border, background, and text color appropriately.

Describe alternatives you've considered
N/A

Additional context
N/A