map package versions to nixpkgs revisions
alternative implementation of lazamar/nix-package-versions
upstream issue: Use git log instead of downloading xy tar archives
early draft
dont fetch full tarball of every nixpkgs revision
use a deep clone of the nixpkgs repo
avoid nix eval via nix-env -q
parse package updates from output of git log
and git diff
static files can be hosted on github pages
use package attribute as path, for example python3Packages/requests.html