Build and install doc projects.
Initialize with a base_project, which will be at the root of the dest dir when installed.
The install step is required to have redistributable documentation folder, while you can browse the documentation directly from the build dir.
Configure the projects in the right order
Build the projects in the right order, making sure they are configured first
Regenerate translation catalogs for the top project
Install the doc projects to a dest dir
Get the list of project deps