Add support for default themes

**Please describe your request or idea**
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Currently, the components are unstyled by default but if any wants to start using the package fast the user requires at least 2 themes ready to use:
- Minimal.
- Neo-brutal.

**Describe the solution you'd like**
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We can follow the steps of the Radix Themes project to offer this functionality without so much hassle.

**Additional context**
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