Feat: addition of Dark mode/ Light mode button

[Jagpreet153]

Describe the feature

I will be adding a button in top of website for making transition between light and dark mode

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Record

• [X] I agree to follow this project's Code of Conduct
• [X] I'm a GSSOC'24 contributor
• [X] I want to work on this issue

[TheNikhilRaj]

I would like to work on this issue , please assign this to me. @XceeDesigns