Revert "initial NextChair Manager."

This reverts commit b219fb4519.

README.md

@@ -288,27 +288,6 @@ docker compose -f stacks/infra/compose.yaml up -d
 docker compose -f stacks/caddy/compose.yaml up -d
 ```
 
-Start the Manager stack as well, after copying its environment template and
-setting a strong platform-admin password and auth secret:
-
-```bash
-cp stacks/manager/.env.example stacks/manager/.env
-docker compose -f stacks/manager/compose.yaml up -d
-```
-
-Add a Manager-only Caddy route in `stacks/caddy/sites/manager.caddy`, replacing
-the example hostname with the private/admin hostname you control:
-
-```caddy
-manager.example.com {
-    reverse_proxy nextchair-manager:3000
-}
-```
-
-Reload Caddy after adding the route, then open `/manager`. The Manager has its
-own administrator session and does not use any business customer, staff, or
-owner account.
-
 The MySQL port is loopback-only by default. Use an SSH tunnel for database
 administration rather than opening port 3306 publicly.