style: Implement dark mode

[Readpato]

Description

Summary

• Install UnoCSS Mini Preset
• Create UnoCSS shortcuts for all possible implemented styles to enable flexibility
• Implement dark mode
• Closes Dark mode #75

Changes

What kind of change does this PR introduce? (check at least one by adding an "x" between the brackets)

• Build-related changes
• Bugfix
• Code style update
• Feature
• Refactor
• Style:
  • Implement dark mode
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

Screenshots and videos

• If applicable, add screenshots or a video to help explain your problem.

leches-dark-mode.mov

The PR fulfils these requirements:

• TresJS code of conduct

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Dark mode is a good implementation to improve the UX for everyone that utilizes the package.

Other information:

Let me know any changes that need to be done if needed!

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[Readpato]

Close PR in favour of #95