Setup nixnuc, rework home manager files

modules/system/common/all-nixos.nix

@@ -0,0 +1,54 @@
+{ config, pkgs, hostname, username, ... }: {
+  imports = [
+    ./linux/internationalisation.nix
+  ];
+
+  environment = {
+    shells = with pkgs; [ bash zsh ];
+    systemPackages = with pkgs; [
+      dconf2nix
+      file
+      neofetch
+      python3
+      tailscale
+      unzip
+      wget
+    ];
+  };
+
+  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"
+    ];
+    trusted-users = [ "${username}" ];
+  };
+
+  programs = {
+    zsh.enable = true;
+  };
+
+  security.sudo.wheelNeedsPassword = false;
+
+  services.tailscale = {
+    enable = true;
+  };
+
+  time.timeZone = "America/New_York";
+
+  users.defaultUserShell = pkgs.zsh;
+}