added light/dark mode

[alefever39]

Summary of changes

• added light and dark mode
• changed styling of links

Related Issue

Add a 'dark-mode' to your card ( from issue #4) #93

How to test (for features) / reproduce (for bugs)

N/A

Screenshots

Changes include

• [ ] Bugfix (non-breaking change that solves an issue)
• [X] New feature (non-breaking change that adds functionality)
• [ ] Documentation (explains but does not affect functionality)
• [ ] Breaking change (change that is not backwards-compatible and/or changes current functionality)

Notes

• please consider including a gif that reflects your feelings about this PR

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