docs: guide for moving CodeCraft to another host (Unraid, bind mounts, tools disk)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -105,7 +105,8 @@ published image there and runs `scripts/smoke-test.sh`. The old container is onl
 you can roll back. `--help` lists the options (owner, port, bind address, dry run).
 `--tools-dir /mnt/disks/ssd/codecraft` puts everything agents install or download – the agent
 home (`/data/home`: toolchains, pip/npm/cargo packages, caches), the users' homes and `/tmp` – on
-a separate disk; the data folder keeps only the database, configuration and backups.
+a separate disk; the data folder keeps only the database, configuration and backups. Step by step,
+with rollback and troubleshooting: [docs/MOVING.md](docs/MOVING.md).
 
 ## How it works