valid breadcrumb links in the header of directory listing at {cid}.ipfs.example.com/sub/dir (TODO: cleanup Kubo-specifics) (HTTP proxy)

Implementation	bifrost-gateway	boxo	kubo
Conformance Version	main	main	main
Total	✅8	✅8	✅8
Body	✅2	✅2	✅2
Status code	✅2	✅2	✅2