Amend breadcrumbs to link to the section indexes, i.e., home/section/

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
Merge pull request #5231 from ostezer/fix-breadcrumbs

Amend breadcrumbs to link to the section indexes, i.e., home/:section/