Add Docker update documentation (#1170)

website/docs/installation/docker.md

@@ -82,9 +82,17 @@ This setup is recommended only if you are running TeslaMate **on your home netwo
    docker-compose up -d
    ```
 
+### Update
+
+To update the running Teslamate condiguration to the latest version, run the following commands:
+
+```bash
+docker-compose pull
+docker-compose up -d
+```
+
 ## Usage
 
 1. Open the web interface [http://your-ip-address:4000](http://localhost:4000)
 2. Sign in with your Tesla account
 3. The Grafana dashboards are available at [http://your-ip-address:3000](http://localhost:3000).
-