winit-core/keyboard: use keyboard_types

Closes #2394.

docs/ATTRIBUTION.md

@@ -2,14 +2,6 @@
 
 These images are used in the documentation of `winit`.
 
-## keyboard_*.svg
-
-These files are a modified version of "[ANSI US QWERTY (Windows)](https://commons.wikimedia.org/wiki/File:ANSI_US_QWERTY_(Windows).svg)"
-by [Tomiĉo] (https://commons.wikimedia.org/wiki/User:Tomi%C4%89o). It was
-originally released under the [CC-BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/deed.en)
-License. Minor modifications have been made by [John Nunley](https://github.com/notgull),
-which have been released under the same license as a derivative work.
-
 ## `coordinate-systems*`
 
 These files are created by [Mads Marquart](https://github.com/madsmtm) using