Contribution section, git section, new users
In the contribution section, git, there's a link to the frontpage of gitlab.tails.boum.org. When someone is new, they would end up at the 'sign in' page, with a register new user as well. It's probably easier, for the occasional visitor, to change the text:
To browse most of our repositories, you can have a stroll on [our gitlab](https://gitlab.tails.boum.org/tails/). To actually contribute, you need to register. See the [[documentation about how we're using GitLab|contribute/working_together/GitLab]].
Or something along those lines.