L2SS-766: Alerta datasource got moved to a dedicated server container

docker-compose/grafana/datasources/alertaui.yaml

@@ -12,7 +12,7 @@ datasources:
     # <string> custom UID which can be used to reference this datasource in other parts of the configuration, if not specified will be generated automatically
     uid: alertaui
     # <string> url
-    url: http://alerta-web:8080/api
+    url: http://alerta-server:8080/api
     # <string> Deprecated, use secureJsonData.password
     password:
     # <string> database user, if used