add nav breadcrumbs
Created by: deepakduggirala
Adapted from https://github.com/IUSCA/bioloop/pull/54 / 17-breadcrumbs branch developed by @ri-pandey
Created by: deepakduggirala
Adapted from https://github.com/IUSCA/bioloop/pull/54 / 17-breadcrumbs branch developed by @ri-pandey