Move Nix files into a nix directory

Move everything from `config` to the root level.

nix/modules/nixos/desktop/default.nix

@@ -0,0 +1,9 @@
+{
+  imports = [
+    ../.
+    ./fonts.nix
+    ./gitea.nix
+    ./jellyfin.nix
+    ./immich.nix
+  ];
+}

nix/modules/nixos/desktop/fonts.nix

@@ -0,0 +1,36 @@
+{ pkgs, ... }:
+
+let
+  theme = import ../../../lib/theme { inherit pkgs; };
+in
+{
+  environment.systemPackages = with pkgs; [
+    terminus_font
+    terminus_font_ttf
+  ];
+
+  fonts = {
+    fontconfig = {
+      enable = true;
+      defaultFonts = {
+        monospace = [ theme.fonts.monospace.name ];
+      };
+    };
+
+    packages =
+      with pkgs;
+      [
+        (nerdfonts.override {
+          fonts = [
+            "AnonymousPro"
+            "FiraCode"
+            "GeistMono"
+            "IntelOneMono"
+            "Iosevka"
+            "JetBrainsMono"
+          ];
+        })
+      ]
+      ++ [ theme.fonts.monospace.package ];
+  };
+}

nix/modules/nixos/desktop/gitea.nix

@@ -0,0 +1,17 @@
+{ pkgs, ... }:
+
+{
+  services.gitea = {
+    enable = true;
+
+    settings = {
+      server = {
+        HTTP_PORT = 2222;
+      };
+
+      service = {
+        DISABLE_REGISTRATION = true;
+      };
+    };
+  };
+}

nix/modules/nixos/desktop/immich.nix

@@ -0,0 +1,7 @@
+{ pkgs, ... }:
+
+{
+  services.immich.enable = true;
+
+  environment.systemPackages = [ pkgs.immich-cli ];
+}

nix/modules/nixos/desktop/jellyfin.nix

@@ -0,0 +1,6 @@
+{
+  services.jellyfin = {
+    enable = true;
+    openFirewall = true;
+  };
+}