- **What**: Replaced outdated `ReadMeServer.md` with detailed documentation covering:
- Server paths (repo, local test server, NixOS deployment)
- `.env` configuration for world-specific datapack sync
- Script workflows (`sync-with-shelve.sh`, `export-serverpack.sh`, etc.)
- Local server initialization and Java 25 requirement
- Datapack synchronization (including `--watch` mode)
- **Why**: Standardize server management workflows, improve maintainability, and provide clear guidance for developers/admins. Updated for **MC 26.1.2** and Fabric compatibility.
