keyboard: fix capslock backspace bind for some programs

system/configuration.nix

@@ -22,6 +22,7 @@
     ./users.nix
     ./containers.nix
     ./network.nix
+    ./keyboard.nix
     ../settings
   ];
 

system/keyboard.nix

@@ -0,0 +1,15 @@
+{ pkgs, lib, ... }:
+{
+  services.keyd = {
+    enable = true;
+    keyboards.default = {
+      ids = [ "*" ];
+      settings = {
+        "main" = {
+          # Some programs don't respect colemaks capslock bind, so we force it here
+          "capslock" = "backspace";
+        };
+      };
+    };
+  };
+}