[HTML theme] add "Navigate to the Top" button

[kavania2002]

Is your feature request related to a problem? Please describe.
Let's say I'm looking into Debugging Tips in contributing guideline page. It's tiring to roll back to top to get back to heading.

Describe the solution you'd like
A to the top button at the bottom right corner might help and avoid excessive scrolling.

[picnixz]

While I understand the needs of a Prev/Next, on Firefox, you can already go down with Ctrl+Down keys. I don't think we'll add it for our own theme but you can suggest your idea to Furo (this is the theme used in your example).

at the bottom right corner

In our current theme, this place is already taken by the versioning widget from RTD =/

@chrisjsewell IIRC, you recently added Next/Previous buttons, do you think it makes sense to have such button? (for me, no, because you can have it with basic keyboard features but I'd be happy to hear your thoughts).

[kavania2002]

I think Furo already has. It kind of have at the top centre while scrolling up.

[chrisjsewell]

do you think it makes sense to have such button?

100% yes, not everyone knows/wants to learn keyboard shortcuts 😉 plus mobile devices do not have keyboards

And yeh furo already has "jump to top" functionality; haven't had a look at the implementation yet though

[picnixz]

I'm personally +0 but if you want to take upon the implementation (or someone else could), I don't mind. I'm currently trying to fix PEP 695 parsing for LaTeX builds

[chrisjsewell]

Oh yeh it's not a priority, I don't know if I will have time soon for this, but I'm open to it (in the non-intrusive way like implemented in furo)

[kavania2002]

Hey, can I work on this issue? I'm new to this organisation so this might help me to learn some new things.

[picnixz]

Yes sure! I'll assign the issue to you!

[kavania2002]

Where do you suggest adding this (navigate to top) button, besides Previous/Next or like the one furo has (at the top centre)?
And which theme should I add this into, or should I include it in basic?
cc: @picnixz @chrisjsewell