Feat: Add dark mode toggle button in the nav bar to improve user experience

[Vikashchou-dhary]

Describe the feature

Adding toggle button for dark and light mode

Describe the solution you'd like

Adding toggle button for dark and light mode

Describe alternatives you've considered

adding toggle button will improve the user experience

Add ScreenShots

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

[minakshikr7]

Please assign me this issue under @GSS0C24