Darkmode2-adding the toggle button for dark mode

[kumarshobhit]

What is the change?

added the toggle button for dark mode and corrected some comments.

What does it fix/add?

provides the utility to switch to dark mode. https://github.com/Neilblaze/Anyxz/issues/1

How was it tested?

ui has been approved by the author

Submissions guide:

• [ ] Have you followed the Contribution guide?
• [ ] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• [ ] Have you made corresponding changes to the documentation?
• [ ] Your submission doesn't break any existing feature.
• [ ] Have you lint your code locally prior to submission?

Screenshots (if appropriate):

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[Neilblaze]

@kumarshobhit also update the issue description & tag the issue link in the same.