Back-to-top link not shown about just-the-docs HOT 1 OPEN

Thanks for submitting this issue! I agree with both the expected behavior and additional context points.

Without having implemented it yet, I think the following should be simple-ish to do:

• render back_to_top even if footer_content/*_edit_* is not set
  • thing to look at: does this look good? unsure
• allow individual pages to override back_to_top (we've done this before w/ other site config variables)
• document back_to_top
• document that the footer will appear if at least one of back_to_top or footer_content or the *_edit_* is specified

Does that seem like it properly captures the issue? If so, we can mark this as ready to implement, and I can add it to my backlog (time to complete is up-in-the-air) and/or have someone else take it on (e.g. you!).

From a bigger picture perspective, it would be great to eventually nest all of these keys under some sort of footer key - that way, it would make it more clear that back_to_top is dependent on the footer being rendered. Ex, I'm thinking something like this:

footer:
    content: "Lorem ipsum..." # this would replace site.footer_content
    back_to_top: true # this would replace site.back_to_top
    # ditto for last_edit, gh_edit, ...

This would be a breaking change, so we'd probably have to defer to a v1. Broadly speaking, do you think this is a good idea?

from just-the-docs.