Update installation instruction for macOS+Nix
Update installation instruction for macOS+Nix

asciinema/asciinema-server,asciinema/asciinema.org,asciinema/asciinema-server,asciinema/asciinema.org,asciinema/asciinema-server,asciinema/asciinema.org,asciinema/asciinema-server,asciinema/asciinema.org