Fixes 14bf1f9c

Appstream decided to use reversed domains. Please merge before 46 if possible.

This corrects arrow directions in RTL.

General polish on the words.

- Add the `<developer><name>` tag
- Mark the `<developer_name>` tag as deprecated
- Use appstreamcli to validate appdata
- Add vcs-browser and the translate URLs
- Update the donation URL

* GtkBox isn't meant to be subclassed, and apps should not do it.
Instead they should subclass AdwBin or GtkWidget depending on their
use case.

* The main reason we were using GtkBox was to contain our header
and our content. Now we use AdwToolbarView for that purpose.

This only leaves us with only one translatable string defined on a rust file,
due to the low gettext/rust support...

It is nowadays similar to the ImagePageWidget, so let us just use that

Instead of doing multiple overlays, do a single overlay containing all
buttons as type=overlay children. This makes the carousel span the
window from start to end.

This allow us to simplify the changes on the UI part

it doesn't make much sense now, but it will do once we port the rest of widgets as well

makes iteration on the UI slower

* .page-body is indistinguishable from the default body style
* libadwaita uses .title-1, so .page-title can be swapped out
* .large-title was unused
* Other empty styles removed

The defaults work fine.

This commit upgrades our rust dependencies and ports
Tour to libadwaita+GTK4. As part of porting we now use
GtkPicture instead of GtkImage, and AdwClamps to hold pages
in place.

This port is part of https://gitlab.gnome.org/GNOME/Initiatives/-/issues/26 and handles https://gitlab.gnome.org/GNOME/Initiatives/-/issues/32

Fixes https://gitlab.gnome.org/GNOME/gnome-tour/-/issues/36

fixes https://gitlab.gnome.org/GNOME/gnome-tour/-/issues/45

- clean up unused pages
- add keyboard overview
- add search
- reword

Fixes https://gitlab.gnome.org/GNOME/gnome-tour/-/issues/41
Fixes https://gitlab.gnome.org/GNOME/gnome-tour/-/issues/42

tweak super key illustration

tweak super key illustration