feat: add monochrome-light and monochrome-dark gradient themes

[FajarKim]

Description

Added new gradient themes, monochrome-light-gradient and monochrome-dark-gradient

Type of change

• Bug fix (added a non-breaking change which fixes an issue)
• New feature (added a non-breaking change which adds functionality)
• Updated documentation (updated the readme, templates, or other repo files)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Misc change (updated other files non-breaking change)

How Has This Been Tested?

• Tested locally with a valid username
• Tested locally with an invalid username
• Ran tests with npm test
• Added or updated test cases to test new features

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Screenshots

• Monochrome Light Gradient

• Monochrome Dark Gradient

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Name	Status	Preview	Comments	Updated (UTC)
github-readme-profile	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 15, 2024 9:55am