feat: Install ghorg
For easy cloning of all of a user/organisation's repos. The 21.11 version doesn't work with GitLab, but that can be temporarily remedied by running this:
nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/\
10d4f89c44c9bf2fe262359c220d64209de39bc7.tar.gz --packages ghorg