stage-usb-share.sh --no-blancco-release leaves out boot-tools/blancco's
vendor release (config.img carries this site's licensing Wi-Fi password and
location) and the unused blancco-uki.efi. The KB's Part 4 now has the site
load its own Blancco 7.20 ISO on Updates > Blancco releases. The Wi-Fi
password is gone from SITE-CUSTOMIZATION.md.