fix: remove DATABASE_URL from docker-compose, now in Infisical

DATABASE_URL, ADMIN_DIDS, and ENCRYPTID_DEMO_SPACES are now stored
in Infisical and injected via the entrypoint. Remove the last
docker-compose.yml reference that was temporarily re-added.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -37,7 +37,6 @@ services:
       - IMAP_PORT=993
       - IMAP_TLS_REJECT_UNAUTHORIZED=false
       - TWENTY_API_URL=https://rnetwork.online
-      - DATABASE_URL=postgresql://rspace:${POSTGRES_PASSWORD}@rspace-db:5432/rspace
     depends_on:
       rspace-db:
         condition: service_healthy