Refactor: Simplify module structure and reorganize services

- Removed system/ directory, merged applications into users/geir.nix
- Simplified fonts.nix to bare minimum (users can add more)
- Moved transmission.nix to sleeper-service/services/ (machine-specific)
- Organized grey-area services into services/ directory
- Updated import paths and tested all configurations
- Added research documentation for deploy-rs and GNU Stow

machines/grey-area/configuration.nix

@@ -0,0 +1,97 @@
+{ config, pkgs, ... }:
+
+{
+  imports =
+    [ # Include the results of the hardware scan.
+      ./hardware-configuration.nix
+      ./starship.nix
+      ./aliases.nix
+      ./podman.nix
+      ./libvirt.nix
+      ./incus.nix
+      ./jellyfin.nix
+      ./tailscale.nix
+      ./calibre-web.nix
+      ./audiobook.nix
+      #./ollama.nix
+      ./forgejo.nix
+    ];
+
+  # Swap zram
+  zramSwap = {
+    enable = true;
+    algorithm = "zstd";
+  };
+  # Use the GRUB 2 boot loader.
+  boot.loader.grub.enable = true;
+  boot.loader.grub.efiSupport = true;
+  boot.loader.grub.efiInstallAsRemovable = true;
+  boot.loader.efi.efiSysMountPoint = "/boot/";
+  boot.loader.grub.device = "nodev"; 
+
+  # Disks and Updates
+  services.fstrim.enable = true;
+
+  # Mount remote filesystem
+  fileSystems."/mnt/remote/media" = {
+    device = "sleeper-service:/mnt/storage";
+    fsType = "nfs";
+    options = [ "x-systemd.automount" ];
+  };
+
+  # Enable all unfree hardware support.
+  hardware.firmware = with pkgs; [ firmwareLinuxNonfree ];
+  hardware.enableAllFirmware = true;
+  hardware.enableRedistributableFirmware = true;
+  nixpkgs.config.allowUnfree = true;
+  services.fwupd.enable = true;
+
+  # Networking
+  networking.hostName = "grey-area"; 
+  networking.networkmanager.enable = true;  
+
+  # Set your time zone.
+  time.timeZone = "Europe/Oslo";
+
+
+  i18n.defaultLocale = "en_US.UTF-8";
+  console = {
+    font = "Lat2-Terminus16";
+    keyMap = "no";
+  };
+
+  users.users.geir = {
+    isNormalUser = true;
+    extraGroups = [ "wheel"
+                    "networkmanager"
+                    "libvirt"
+                    "podman"
+		    "incus-admin"
+                  ];
+    packages = with pkgs; [
+        bottom fastfetch nerdfetch
+    ];
+  };
+
+  environment.systemPackages = with pkgs; [
+    neovim emacs nano curl htop glances kitty 
+    wget git inxi nethogs fastfetch
+  ];
+
+  # Enable the OpenSSH daemon.
+  services.openssh.enable = true;
+  services.openssh.settings.PermitRootLogin = "no";
+  services.openssh.settings.PasswordAuthentication = true; 
+
+
+  # Enable Netdata
+  services.netdata.enable = true;
+
+  # Firewall
+  networking.firewall.enable = true;
+  networking.firewall.allowedTCPPorts = [ 22 19999 23231];
+  networking.firewall.allowedUDPPorts = [ 22 23231 ];
+  networking.nftables.enable = true;
+  system.stateVersion = "23.05"; # Do not change this, it maintains data compatibility.
+
+}