Revert "initial NextChair Manager."

This reverts commit b219fb4519.

stacks/manager/compose.yaml

@@ -1,24 +0,0 @@
-name: nextchair-manager
-
-# Platform administration is its own application stack. It shares only the
-# private proxy network with Caddy and uses no business database.
-
-services:
-  nextchair-manager:
-    image: ${NEXTCHAIR_IMAGE:-nextchair:latest}
-    container_name: nextchair-manager
-    restart: unless-stopped
-    env_file:
-      - .env
-    environment:
-      MANAGER_MODE: "true"
-    volumes:
-      - ../:/app/stacks
-      - ../../.env.infra:/app/.env.infra:ro
-    networks:
-      - nextchair-proxy
-
-networks:
-  nextchair-proxy:
-    name: nextchair-proxy
-    external: true