feat: theme support

[gabitoesmiapodo]

Closes #80

Description:

• Added theme support with the help of https://github.com/pacocoursey/next-themes#readme
• Added button to switch themes.
• Added README entry.
• Fixed breakpoints function.

Steps:

• Use the theme switch button.
• The theme should switch.

Type of change:

• New feature
• Bug fix
• Breaking change
• Enhancement
• Refactoring
• Chore

How Has This Been Tested?

• Manual testing
• Automated tests
• Other (explain)

Remember to check that:

• Your code follows the style guidelines of this project
• You have performed a self-review of your code
• You have commented your code in hard-to-understand areas
• You have made corresponding changes to the documentation
• Your changes generate no new warnings

Screenshots

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