Fix #386

Fix #80

Levente Polyak authored 3 years ago and Jelle van der Waa committed 3 years ago

This shouldn't be possible as it may lead to accidentally allowing
external users to be added to a project.
We should only add members to a project or group on staff request to
devops.

We've stopped providing kvm and virtualbox special devices as they are not actually necessary.

This also deprecates the somehwat disconnected docs github-mirror.md and new-gitlab.project.md