[Feature]: Dark Mode Toggle

[ashutosh-7503]

So, what is it about?

Add a toggle button to enable/disable dark mode.

Code of Conduct

• I agree to follow this project's Code of Conduct

[shaurya-8055]

@ashutosh-7503 can you Please assign this issue to me

[urastogi2048]

@ashutosh-7503 Sir please assign this issue to me