BookStack is not being used. All books are managed in Kavita (kavita.kitestacks.com).
- Reverted bookstack/docker-compose.yml to pre-SSO state (no OIDC env vars, no kitestacks network)
- Removed bookstack/.env OIDC secret placeholder
- Updated docs/authentik-sso-setup.md: BookStack removed from SSO scope
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>