In each info manual's DIR-ENTRY metadata, it's best to use just the
filename, with no subdirectory. This should facilitate working info
manuals in packaged versions of hledger, eg in nix.
I don't remember the detail of why I added those and I'm not going to
spend a couple of hours retesting; hopefully no other significant
workflows will be affected.
I have left the subdirectory paths in the dir file - this is intended
for hledger developers and they hopefully don't cause a problem there.