make wikis more editable

wikis can only be edited by members of the Developer group in a project, according to the upstream documentation. that is problematic because that permission also grants access to the source code in a project.

we'd like to have more flexibility in that regard: wikis are ideal for drive-by contributions who we might not want to grant special privileges to. similarly, teams should be able to edit each other's wiki, since documentation is often collaborative across teams.

let's see if that's possible at all.

There's an upstream feature request to make wikis publicly editable and another to allow visitors to suggest edits. the wireshark team uses a separate wiki with MR wokflow to allow outside contributions, but that feels rather clunky.