Manual generation of vue app files
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The directories vue2-app and vue3-app contain many javascript dependencies which
are not packaged yet by Debian. The script debian/vue-apps/update.sh contains a
workaround, that locally builds the projects within vue*-app, and saves the
built files with debian/vue-apps.

The script is *not* supposed to be run within the debian build system. Instead,
the script must be run at every upstream version upgrade.