c5f40198f3
Previously we had three services for different config flavors. This is confusing because only one instance of IPFS can run on a host / port combination at once. So move all into ipfs.service, which contains the configuration specified in services.ipfs. Also remove the env wrapper and just use systemd env configuration.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.