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 #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
• [X] Code style update
• [X] Feature
• [ ] Refactor
• [X] Style:
  • Implement dark mode
• [ ] Other, please describe:

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

• [ ] Yes
• [X] No

Screenshots and videos

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

https://github.com/Tresjs/leches/assets/87768087/d9b68b2c-660a-4cea-a2cd-faa29c60581f

The PR fulfils these requirements:

• [X] TresJS code of conduct

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

• [x] 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