Simplify caps-lock remapping

It turns out that all other methods I have tried overrides disabling the
touchpad while typing. Only interception-tools seems to work.

nixos/flake.nix

@@ -3,7 +3,6 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";
-    xremap-flake.url = "github:xremap/nix-flake";
   };
 
   outputs = { self, nixpkgs, ... } @ inputs:
@@ -13,7 +12,7 @@
   in
   {
     nixosConfigurations = {
-      nix = nixpkgs.lib.nixosSystem {
+      macbook = nixpkgs.lib.nixosSystem {
         specialArgs = { inherit inputs outputs; };
         modules = [ ./nixos/configuration.nix ];
       };