add (unused) urxvt

it seemed to run at like a super low framerate so paging through
things felt pretty awful

users/rin/urxvt.nix

@@ -0,0 +1,23 @@
+{ config, ... }: {
+  programs.urxvt = {
+    enable = true;
+    fonts = [ "xft:Cascadia Code:size=12.4" ];
+    scroll.bar.enable = false;
+    extraConfig = {
+      background = "[65]#000000";
+      depth = 32;
+
+      cursorBlink = true;
+      letterSpace = 0;
+      lineSpace = 0;
+      saveline = 4096;
+      urlLauncher = "firefox";
+      underlineURLs = true;
+      urlButton = 1;
+
+      perl-ext = "";
+      perl-ext-common = "";
+    };
+  };
+}
+