Add a caps-rebinding using xmodmap
diff --git a/modules/xmodmap.nix b/modules/xmodmap.nix
new file mode 100644
index 0000000..3e250ed
--- /dev/null
+++ b/modules/xmodmap.nix
@@ -0,0 +1,9 @@
+{ pkgs, ... }: {
+  home.home = {
+    packages = [ pkgs.xorg.xmodmap ];
+    file.".Xmodmap".text = ''
+      keycode 66 = F12
+      clear Lock
+    '';
+  };
+}