[Feat] dark mode button

[jeevika17]

Description

darkmode button can change the the theme to light and dark

Screenshots

No response

Checklist

• [X] I have checked the existing issues
• [X] I have read the Contributing Guidelines
• [X] I'm a GSSoC'24-Extd contributor
• [ ] I'm a Hacktoberfest'24 contributor
• [ ] I am willing to work on this issue (optional)

[github-actions[bot]]

👋 Thank you @jeevika17 for raising an issue! We appreciate your effort in helping us improve. Our team will review it shortly. Stay tuned!

[Rajansharma44]

hii @rajatuiwebdev would you assign this issue to me?

[jeevika17]

@rajatuiwebdev completed the issue please check the pr #141