Forum "back" button should be breadcrumbs

[Southclaws]

Breadcrumbs would show a more logical path and it would be more clear what the user is "returning" to.

Because, a "back" button implies they'd go back to where they came from, there are issues with this:

• browser already has a "back" button, no need to re-invent it
• you can land on a thread from many different places, so it's not clear where "back" actually is

Solution: https://chakra-ui.com/docs/navigation/breadcrumb