Update readme

packages/langium-railroad/README.md

@@ -1,16 +1,5 @@
-# Integration of Langium and Sprotty
+# Langium Railroad Diagrams
 
-This package provides glue code for [Langium](https://langium.org) and [Sprotty](https://www.npmjs.com/package/sprotty). It includes the following features:
+This package provides the ability to build railroad syntax diagrams for [Langium](https://langium.org) grammars.
 
- * Generate diagram models from a Langium AST
- * Listen to document changes and update existing diagram models automatically
- * Hook into the JSON-RPC channel used by the language server
-
-The counterpart of this integration is the [sprotty-vscode](https://www.npmjs.com/package/sprotty-vscode) package, which provides Sprotty diagrams embedded in VS Code webviews and is able to connect with the JSON-RPC stream of a chosen language.
-
-## How to Use This
-
- 1. Implement a diagram model generator by extending `LangiumDiagramGenerator`
- 2. Add `SprottyDiagramServices` to the dependency injection module of your language and bind the `diagram.DiagramGenerator` service
- 3. Add `DefaultSprottyModule` to the `inject` function that sets up your dependency injection container
- 4. Call the `addDiagramHandler` function in your main code to hook into the JSON-RPC stream
+It is reused by the [langium-cli](https://www.npmjs.com/package/langium-cli) package and the [Langium VSCode extension](https://marketplace.visualstudio.com/items?itemName=langium.langium-vscode).