feat: IBM 3270 colors

lib/colours/ibm-3270.nix

@@ -0,0 +1,37 @@
+rec {
+  black = {
+    bright = "#888888";
+    dark = "#222222";
+  };
+  red = {
+    bright = "#ef8383";
+    dark = "#f01818";
+  };
+  yellow = {
+    bright = "#efe28b";
+    dark = "#f8d824";
+  };
+  green = {
+    bright = "#23d830";
+    dark = "#7ed684";
+  };
+  blue = {
+    bright = "#b3bfef";
+    dark = "#7890f0";
+  };
+  magenta = {
+    bright = "#efb3e3";
+    dark = "#f078d8";
+  };
+  cyan = {
+    bright = "#9ce2e2";
+    dark = "#54e4e4";
+  };
+  white = {
+    bright = "#ffffff";
+    dark = "#a5a5a5";
+  };
+  background = "#000000";
+  foreground = "#bbbbbb";
+  cursor = green.bright;
+}

lib/default.nix

@@ -15,7 +15,7 @@ rec {
 
   sshPort = 22022;
 
-  colours = import ./colours/mac-os.nix;
+  colours = import ./colours/ibm-3270.nix;
 
   theme = pkgs: {
     gtk = {