feat(theme): add more color slots

[tripleWdotcom]

These colors will be used and customize in ADA

Describe your changes

Border in <Button> and <Checkbox> are now using the new color slots with the same color as before, so it doesn't break anything.

Checklist before requesting a review

• I have performed a self-review of my own code
• I have verified that the code builds perfectly fine on my local system
• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have verified that my code follows the style already available in the repository
• I have made corresponding changes to the documentation