📝[Docs]: Add "Back to Top" Button

[T-Fathima]

Description: I would like to implement a "Back to Top" button for improved navigation on the site. This feature will allow users to easily return to the top of the page, enhancing overall user experience.

Requirements:
The button should be visible when users scroll down the page.
It should smoothly scroll back to the top when clicked.

I would like to work on it.
Please assign it to me.

[github-actions]

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[github-actions]

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