Add a floating navigation (breadcrumbs)

[Eldenroot]

Now it is impossible to get back (previous button in browser) - it gets you only back to thread where you were redirected but then new posts are loaded again...

would be nice to add a navigation bar on the top of the page, maybe something like this
https://github.com/flarum/core/issues/157#issuecomment-116172854

[WildcardSearch]

This is probably a good idea, I'll just have to see what it would take to make it happen.

I will come back to this.