fix docker images names

docs/tutorial/docker_installation.md

@@ -16,18 +16,24 @@ The simplest real-life pgwatch setup should look something like that:
     GitHub *Releases* page or use the public API with something like
     that:
 
-        curl -so- https://api.github.com/repos/cybertec-postgresql/pgwatch/releases/latest | jq .tag_name | grep -oE '[0-9\.]+'
+```bash
+curl -so- https://api.github.com/repos/cybertec-postgresql/pgwatch/releases/latest | jq .tag_name | grep -oE '[0-9\.]+'
+```
 
 1.  Pull the image:
 
-        docker pull cybertec/pgwatch:X.Y.Z
+```bash
+docker pull cybertecpostgresql/pgwatch-demo:X.Y.Z
+```
 
 1.  Run the Docker image, exposing minimally the Grafana port served on
     port 3000 internally. In a relatively secure environment you'd
     usually also include the administrative web UI served on port 8080:
 
-        docker run -d --restart=unless-stopped -p 3000:3000 -p 8080:8080 \
-        --name pw3 cybertec/pgwatch:X.Y.Z
+```bash
+docker run -d --restart=unless-stopped -p 3000:3000 -p 8080:8080 \
+--name pw3 cybertecpostgresql/pgwatch-demo:X.Y.Z
+```
 
     Note that we're setting the container to be automatically restarted
     in case of a reboot/crash - which is highly recommended if not using
@@ -60,7 +66,7 @@ for v in pg  grafana pw3 ; do docker volume create $v ; done
 docker run -d --restart=unless-stopped --name pw3 \
     -p 3000:3000 -p 8081:8081 -p 127.0.0.1:5432:5432 -p 192.168.1.XYZ:8080:8080 \
     -v pg:/var/lib/postgresql -v grafana:/var/lib/grafana -v pw3:/pgwatch/persistent-config \
-    cybertec/pgwatch:X.Y.Z
+    cybertecpostgresql/pgwatch-demo:X.Y.Z
 ```
 
 Note that in non-trusted environments it's a good idea to specify more
@@ -74,16 +80,16 @@ supported Docker environment variables see the [ENV_VARIABLES.md](../reference/e
 ## Available Docker images
 
 Following images are regularly pushed to [Docker
-Hub](https://hub.docker.com/u/cybertec):
+Hub](https://hub.docker.com/u/cybertecpostgresql):
 
-*cybertec/pgwatch-demo*
+*cybertecpostgresql/pgwatch-demo*
 
 The original pgwatch “batteries-included” image with PostgreSQL measurements
 storage. Just insert connect infos to your database via the admin Web UI (or
 directly into the Config DB) and then turn to the pre-defined Grafana
 dashboards to analyze DB health and performance.
 
-*cybertec/pgwatch*
+*cybertecpostgresql/pgwatch*
 
 A light-weight image containing only the metrics collection daemon /
 agent, that can be integrated into the monitoring setup over