See discussion on #59.
My suggestion from #59:
So we probably should make a User main page (or a subheader on the Participants page) to direct to them.
Those without content I would simply delete (including possible links pointing to them) or redirect if there is something to direct to.
Under MediaWiki the User:XXX pages were essentially user profiles for people contributing to the wiki-based website. So, if people with a User:XXX page ought to be on the participants page, lets add them to that page?
Yes, but possibly with a simpler table/no table/empty table, because we don't have the relevant information.
Redirect Iddo's user page to participants
See issue #61
As @MarkusPiotrowski noted, sometimes we can just delete the user pages - e.g. 2629f7f