How am i supposed to reach this folder from sources.list to be able to apt-get upgrade?

http://idefix.go-nix.ca/nix/dists-files/bora/

With my current line it doesn't work and trying to point to that folder gives a Packages.gz not found error...

deb http://idefix.go-nix.ca/nix/pidgin-dist /

I don't want to remove / install by hand, cheers! ;-)