Extract and update key remapping steps with Wiki

nixos/hardware.nix

@@ -2,12 +2,9 @@
 {
   services.udev = {
     enable = true;
-    # Settings keyremap in raw layer than X. See GH-784
+    # Settings keyremap in raw layer than X. See GH-784 for background. And see https://github.com/kachick/dotfiles/wiki/Key-Remapper for the guide
     #
-    # - Specify hardware names even if `evdev:input:*` working for mostcase. I should care both US and JIS layout
-    # - How to get the KEYBOARD_KEY_700??: `evtest /dev/input/event??`
-    # - How to get the hardware name:: `udevadm info --attribute-walk /dev/input/event?? | grep -F 'ATTRS{name}'`
-    # - How to apply?: Rebuild and reboot. Don't use `sudo systemd-hwdb update && sudo udevadm trigger` except debugging purpose.
+    # Specify hardware names even if `evdev:input:*` working for mostcase. I should care both US and JIS layout
     extraHwdb = lib.mkBefore ''
       evdev:name:Topre REALFORCE 87 US:*
         KEYBOARD_KEY_70039=leftctrl # original: capslock