* Remove obsolete apps
* Add new core apps
* Deduplicate apps which were in both the grid and a folder
* Split system tools out of the utilities folder
* Rearrange the dash a little
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3642>
Defining default apps as serialized GVariants isn't very human-friendly,
which likely contributes to the fact that the lists are in parts horribly
outdated (Books! Cheese! Screenshot! gedit!).
Instead, generate the lists at build time from simple text files, which
should be much easier to update.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3632>
