I am not sure I understand exactly what you are referring to.
Are you proposing to delete folders for obsolete docs from the git repository? If so, and if there are archives (where?), then I am favorable, after all I don't think anyone is using Virgo < 3.5 these days.
But since you are talking about documentation, I would like to ask your advice for another problem.
The Virgo Tools documentation, which I updated in the Virgo documentation git repository is not published to the Web Site, and no one seems to know how that used to happen in the past (I asked Glyn, Leo, Miles and Martin, the latter in person at the EclipseCon after his nice speach).
I guess that is Visible in  because the most recent documentation is for the 3.7.0 M1 release and the following milestones do not exist.