Clarify how the two moderation layers map to hosted and self-hosted
relay deployments.
- State that platform safety belongs to whoever operates the relay, with
hosted and self-hosted accountability spelled out.
- Distinguish the relay/platform operator-and-moderator roster from
community owner and admin roles.
Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Co-authored-by: Alia <d32955ad69077062930cc46cfe2df30ca9aaf6f8e76422681265e9e9af704d78@buzz.block.builderlab.xyz>