R1:a89b4ff5b8bc

Members page of Parent Subproject: less dead-end

Summary:
When you visit the Members page of a Parent Subproject,
some actions are greyed out by design. And, if you click on
them, nothing really useful happens to continue with what
you want to do.

For example, see this page and click on "Join Project":

https://we.phorge.it/project/members/1/

After this change, the interface at least provides a link to
proceed to the next step of what you wanted to do - that is -
allowing to quickly list direct…