sway: gitignore local.d contents, keep dir in repo

sway/.config/sway/local.d/.gitignore

@@ -0,0 +1,5 @@
+# Files in local.d/ are machine-specific and not tracked in dotfiles.
+# Add overrides here per machine, e.g.:
+#   input * { xkb_layout dk_mac_fixed }
+*
+!.gitignore

sway/.config/sway/local.d/keyboard

@@ -1,3 +0,0 @@
-input * {
-    xkb_layout dk_mac_fixed
-}