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Support modules using gi-docgen

See merge request !16

In case the HTML is not distributed with the tarball itself.

This is a tiny bandaid over the mess that is library-web.

We look for a toml file (or a toml file template) in the tarball; if we
find it, we check that it's a gi-docgen project configuration by
looking for the `[library]` section. The basename of the project's
configuration file is assumed to be the name of the documentation
module, which will then be used to match the various metadata expressed
in the overlay file.

Once we find a gi-docgen project configuration file, we look for HTML
files in its proximity—either under a directory with the same name as
the `namespace` key, or a directory with the same basename as the toml
file; this matches the behaviours of GTK and Pango.

Once we find an `index.html`, we start copying everything as is to the
target directory.

Drop 3.9x releases from GTK

See merge request !14

We don't need to show these anymore, now that we
have a stable gtk4.

Replace mentions of GTK+ by GTK

See merge request !13

Update overlay.xml.in for gdk-pixbuf docs tarballs

See merge request !12

Carry over the GTK+ -> GTK change in translations.

GTK has officially dropped the plus a while ago.
Follow along.

GdkPixbuf has been using Meson for a long while, so we need to add the location for the documentation archives.