Remove Service/CDS Modeler part

Still not part of the GA version of the Business Application Studio

exercises-node/exercise01/README.md

@@ -189,14 +189,6 @@ In CAP, APIs are provided through services acting as facades for domain model en
 
  This creates a service called `CatalogService` and exposes a read-only entity `Books` and an insert-only entity `Orders`.
 
-  >For more details on the service definition, right-click the `services.cds` file and choose **Open in Service Modeler** from the context menu.
- >
- ![Open in Service Modeler](./resources/open_in_service_modeler.png)
-  >
- > This opens the CDS Service Modeler that let's you explore the modelled entities and their relationships.
- >
- ![Service Modeler](./resources/service_modeler.png) 
-
  We have prepared an archive that contains `csv` files with sample data for the database.
 
 3. Download [the archive](./resources/bookstore_csvs.zip) and extract the files to any desired location on your local machine.