Section that renames its own URL via front matter, to exercise breadcrumb ancestor links.
This section demonstrates a Hugo section that renames its own URL via the url front matter
field. The content still lives under content/book/, but this list page renders at /books/.
Breadcrumbs on pages inside this section must link back to /books/, not to /book
(the raw content-folder path), since /book is not a page that exists on this site.
This page lives under content/book/example-book.md, so its own permalink stays
/book/example-book/ (child pages are not affected by the parent section’s url
front matter). Its breadcrumb ancestor for “Books”, however, must link to /books/,
matching the section’s actual rendered URL.