Setup nixnuc, rework home manager files

modules/common/nixos/all-hosts.nix

@@ -1,52 +0,0 @@
-{ config, pkgs, hostname, username, ... }: {
-  imports = [
-    ./internationalisation.nix
-  ];
-
-  environment = {
-    shells = with pkgs; [ bash zsh ];
-    systemPackages = with pkgs; [
-      angryipscanner
-      dconf2nix
-      file
-      neofetch
-      python3
-      tailscale
-    ];
-  };
-
-  fonts.fontDir.enable = false;
-  fonts.packages = with pkgs; [
-    font-awesome
-    (nerdfonts.override {
-      fonts = [
-        "Hack"
-        "SourceCodePro"
-      ];
-    })
-  ];
-
-  networking.hostName = "${hostname}";
-
-  nix.settings = {
-    allowed-users = [ "${username}" ];
-    experimental-features = [
-      "flakes"
-      "nix-command"
-    ];
-  };
-
-  programs = {
-    zsh.enable = true;
-  };
-
-  security.sudo.wheelNeedsPassword = false;
-
-  services.tailscale = {
-    enable = true;
-  };
-
-  time.timeZone = "America/New_York";
-
-  users.defaultUserShell = pkgs.zsh;
-}