migrate instructions

docs/ztnet/docs/_usage/_category_.json

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+{
+  "label": "Usage",
+  "position": 2,
+  "link": {
+    "type": "generated-index"
+  }
+}

docs/ztnet/docs/_usage/import_controller.md

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+# Migrate Controller
+## How to Migrate an Established ZeroTier Controller into ZTNET
+
+To move an already established ZeroTier controller into a Docker container, you can follow these steps. This guide assumes you have Docker set up on the machine where the new controller will reside.
+
+### Prerequisites
+- Ensure Docker is installed and running.
+- Stop the ZeroTier service on the source controller to prevent data inconsistencies.
+
+### Steps
+
+1. **Stop the ZeroTier Service on the Source Machine**  
+   Depending on your OS, use the relevant command to stop the ZeroTier service.
+    ```bash
+    sudo systemctl stop zerotier-one  # For systemd-based Linux distributions
+    ```
+    Or for other systems:
+    ```bash
+    sudo service zerotier-one stop  # For SysVinit or Upstart
+    ```
+
+2. **Locate the ZeroTier Configuration Folder**  
+   The configuration folder is typically `/var/lib/zerotier-one` on Linux systems.
+
+3. **Backup Configuration**  
+   Create a backup just to be safe.
+    ```bash
+    sudo cp -r /var/lib/zerotier-one /path/to/backup/folder
+    ```
+
+4. **Copy Configuration to Docker Volume**  
+   Copy the configuration files to the Docker volume specified in your Docker Compose file. Replace `zerotier:/var/lib/zerotier-one` with the actual volume name and path.
+    ```bash
+    sudo cp -r /var/lib/zerotier-one /path/to/docker/volume
+    ```
+
+5. **Start the Docker Container**  
+   Use Docker Compose to start your new ZeroTier controller. Navigate to the directory where your `docker-compose.yml` file is located.
+    ```bash
+    docker-compose up -d
+    ```
+
+6. **Verify the Controller**  
+   Verify that the new Dockerized ZeroTier controller has all the networks and members from the source controller.