as of right now, we don't really have any server-wide rules, as we've been small enough that we haven't really needed them. The rules have been left up to individual communities. My gut feel would be "don't do anything illegal, and stay on topic" for rules at the moment. Is there something specific you're looking for answers on?
I was looking for the server NSFW policy given the events of r/dndmemes; is there one, or is that something this instance would just avoid wanting to host entirely?
Right now the NSFW policy is "tag NSFW stuff" but the actual content is left up to the individual communities, due to the nature of TTRPGs containing adult themes and situations. So if something is outside of the boundaries is entirely up to the mods of the individual communities.