cityseventeen: rename and make tokyo night

hosts/cityseventeen/theme.nix

@@ -0,0 +1,44 @@
+{
+  pkgs,
+  ...
+}:
+let
+  themes = {
+    gtk = {
+      name = "Tokyonight-Dark";
+      package = pkgs.tokyonight-gtk-theme;
+    };
+    icons = {
+      name = "Adwaita";
+      package = pkgs.adwaita-icon-theme;
+    };
+    cursor = {
+      name = "Simp1e-Tokyo-Night";
+      package = pkgs.simp1e-cursors;
+    };
+  };
+in
+{
+  alqueva.system.dconf = {
+    enable = true;
+    luminosity = "dark";
+    theme = themes.gtk.name;
+    icon.theme = themes.icons.name;
+    cursor = {
+      size = 24;
+      theme = themes.cursor.name;
+    };
+  };
+
+  qt = {
+    enable = true;
+    platformTheme = "qt5ct";
+    style = "kvantum";
+  };
+
+  systemd.user.tmpfiles.rules = [
+    "L+ %h/.config/gtk-4.0 - - - - ${themes.gtk.package}/share/themes/${themes.gtk.name}/gtk-4.0"
+  ];
+
+  environment.systemPackages = builtins.attrValues (builtins.mapAttrs (_: v: v.package) themes);
+}