kitty: port over settings from void

- keybind to open new window with same working directory
- automatically choose a contrasting foreground text color if the text
  color is too similar to the background color

home-manager/home.nix

@@ -72,6 +72,14 @@ in {
     };
   };
 
-  programs.kitty.enable = true;
+  programs.kitty = {
+    enable = true;
+    keybindings = {
+      "super+shift+enter" = "new_os_window_with_cwd";
+    };
+    settings = {
+      text_fg_override_threshold = 10;
+    };
+  };
   programs.fuzzel.enable = true;
 }