Add regional breadcrumbs

[saylorsd]

Near the region's title on the dashboard, add some breadcrumbs for its parent region(s).

Eventually (maybe a new issue), provide a similar way for jumping to other nearby or overlapping geographies.

e.g.

When looking at a Block Group, the breadcrumbs would be something like this:

Block Group 4

Pennsylvania > Allegheny County > Tract 4610