Add more theme color options

[bpqw]

Fixes Issue🛠️

Closes #723

Description👨‍💻

Changes

• Replaced the original theme switch button with a dropdown menu for better usability.
• Added three new themes with adapted button and navigation bar colors.

Additional Notes

• Background images can be customized by replacing files in Beautiify\assets\images.
• Please review and provide feedback or suggestions.

Type of Change📄

• New feature (non-breaking change which adds functionality)
• Style (non-breaking change which improves website style or formatting)

Checklist✅

• I am an Open Source contributor
• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have commented on my code, particularly in hard-to-understand areas

Screenshots/GIF📷

[netlify]

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[github-actions]

Hey @bpqw, Welcome to the project Beautiify! 🎊
Thanks for your contribution! Your effort makes this project better. Keep it up! 🙌
Please wait for the PR to be reviewed. Happy Coding!! ✨