Remove unused bootstrap host

hosts/bootstrap.nix

@@ -1,54 +0,0 @@
-{
-  config,
-  lib,
-  pkgs,
-  profiles,
-  ...
-}:
-with lib; let
-  # Gets hostname of host to be bundled inside iso
-  # Copied from https://github.com/divnix/digga/blob/30ffa0b02272dc56c94fd3c7d8a5a0f07ca197bf/modules/bootstrap-iso.nix#L3-L11
-  getFqdn = config: let
-    net = config.networking;
-    fqdn =
-      if (net ? domain) && (net.domain != null)
-      then "${net.hostName}.${net.domain}"
-      else net.hostName;
-  in
-    fqdn;
-in {
-  # build with: `nix build ".#nixosConfigurations.bootstrap.config.system.build.isoImage"`
-  imports = [
-    # profiles.networking
-    profiles.users.root # make sure to configure ssh keys
-    profiles.users.pub-solar
-    profiles.base-user
-    profiles.graphical
-    profiles.pub-solar-iso
-  ];
-
-  config = {
-    boot.loader.systemd-boot.enable = true;
-
-    # will be overridden by the bootstrapIso instrumentation
-    fileSystems."/" = {device = "/dev/disk/by-label/nixos";};
-
-    system.nixos.label = "PubSolarOS-" + config.system.nixos.version;
-
-    # mkForce because a similar transformation gets double applied otherwise
-    # https://github.com/divnix/digga/blob/30ffa0b02272dc56c94fd3c7d8a5a0f07ca197bf/modules/bootstrap-iso.nix#L17
-    # https://github.com/NixOS/nixpkgs/blob/aecd4d8349b94f9bd5718c74a5b789f233f67326/nixos/modules/installer/cd-dvd/installation-cd-base.nix#L21-L22
-    isoImage = {
-      isoBaseName = mkForce (getFqdn config);
-      isoName = mkForce "${config.system.nixos.label}-${config.isoImage.isoBaseName}-${pkgs.stdenv.hostPlatform.system}.iso";
-    };
-
-    # This value determines the NixOS release from which the default
-    # settings for stateful data, like file locations and database versions
-    # on your system were taken. It‘s perfectly fine and recommended to leave
-    # this value at the release version of the first install of this system.
-    # Before changing this value read the documentation for this option
-    # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
-    system.stateVersion = "21.05"; # Did you read the comment?
-  };
-}