add takamaki config, clean up host configs

hosts/takamaki/configs/kitty.nix

@@ -0,0 +1,12 @@
+{
+  pkgs,
+  ...
+}: {
+  imports = [
+    ../../../global-configs/kitty.nix
+  ];
+
+  programs.kitty = {
+    themeFile = "Arthur";
+  };
+}