[Keymap] Update to oeywil's keymap (#5614)

* Switched to grid, added leader key and space cadet shift

* renamed layer, removed sound

* fixed comment

* added comment

* Added tap dance

* Added comments

* removed useless sound

* removed useless comments

* removed useless cases

* changed to register_code16 function

* renamed variables

* fixed typo

* fixed indentation

keyboards/planck/keymaps/oeywil/readme.md

@@ -1,9 +1,4 @@
 About
 ------
 
-A simple Norwegian Layout.
-
-Layout
--------
-
-![Layout](https://i.imgur.com/GQ4iM6B.png "Keyboard Layout")
+A simple Norwegian grid layout using Leader Key, Space Cadet Shift and audio.