rename example docker compose file and fix volume

docker-compose.yml

@@ -0,0 +1,17 @@
+services:
+  reticulum-meshchat:
+    container_name: reticulum-meshchat
+    image: ghcr.io/liamcottle/reticulum-meshchat:latest
+    pull_policy: always
+    restart: unless-stopped
+    # Make the meshchat web interface accessible from the host on port 8000
+    ports:
+      - 0.0.0.0:8000:8000
+    volumes:
+      - meshchat-config:/config
+    # Uncomment if you have a USB device connected, such as an RNode
+    # devices:
+    #   - /dev/ttyUSB0:/dev/ttyUSB0
+
+volumes:
+    meshchat-config: