[FEATURE] Add `Dark Mode` in website

[rezwancs]

Is your feature request related to a problem? Please describe.
There is no dark mode on the website

Describe the solution you'd like
Add dark mode to the website

[prerit2001]

Please Assign me this task.

[rezwancs]

@prerit2001 Yes sure, please go ahead.🤩

[Savio629]

Is this feature added or yet to be added?
If not I can start working on it ...