[Feature] Add Scroll to Top button

[SurajPrakash24]

Describe the feature you'd like to request

It will be very efficient for user to directly go to top of page with just one click. This button will be fixed on the page so while scrolling, it will not move.

Describe the solution you'd like

-Implemented a "Scroll to Top" button that appears when the user scrolls down more than 200 pixels.
-Button will smoothly scroll the page back to the top when clicked.
-Add responsive styling for better user experience

Describe alternatives you've considered

No response

Additional context

@Kritika30032002 plz assign this issue to me under gssoc-ext level 2 and hacktoberfest-accepted