add a link to request developer status
Until there are personal forks, only developers can issue merge requests which increases drive-by contributor's friction: they need to find the "request access" link on the pypy group to get access to the pypy project. We would like to publish a link in our external documentation to the "request access" link, currently https://foss.heptapod.net/groups/pypy/-/group_members/request_access, but it needs some authentication to work.