[FEAT]: Add Dark Mode Support

[ImBIOS]

Clear and concise description of the problem

Dark mode is a feature request for the Gitmemoji repository on GitHub that would allow users to switch the interface to a darker color scheme, which is easier on the eyes in low-light environments and reduces eye strain. This feature would provide a more comfortable and customizable user experience for those who prefer to use Gitmemoji in darker environments or for extended periods of time.

Suggested solution

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Alternative

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Additional context

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Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.