Documentation should be included on KDE DVD (and possibly others)
Per horizon#320, we need to install
docs on the KDE DVD image.
MATE is already pushing the boundaries of a 700 MB CD, so I don't think it will fit there. We may want to do an overview of whether everything included on there is necessary. That should be a separate issue.
LXQt has about 50 MB of room left, and the doc spread there should be about 400 MB uncompressed, so we should be able to fit it on there. We'll have to investigate this, though.