Component-ify the back-to-top button

[ang-zeyu]

Please confirm that you have searched existing issues in the repo

Yes, I have searched the existing issues

Any related issues?

No response

What is the area that this feature belongs to?

No response

Is your feature request related to a problem? Please describe.

The back to top button is a mandatory (iirc..) and "in built" feature in the page build process. The logic is contained within a javascript file.

Describe the solution you'd like

Consider making this optional, and component-ifying it instead.

The feature would be opt in by placing this component in a layout file.

Describe alternatives you've considered

No response

Additional context

No response