The module was imported into the toplevel in !424, but that's at
least a bit weird:
- it's a helper script for one particular aspect (OSK layouts)
- it adds a README.mdwn to our own README.md, and a test/ directory
to our tests/
Move the whole thing to a subdirectory under data/, which is more
appropriate.
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1136
