fix: README and online doc should be harmonized about module usage

Author: Gregcop1

README.md

@@ -11,20 +11,16 @@ API Platform Client Generator is a generator to scaffold app with Create-Retriev
 
 Works especially well with APIs built with the [API Platform](https://api-platform.com) framework.
 
-## Installation
-
-    yarn global add @api-platform/client-generator
-
 ## Usage
 
 **Hydra**
 ```sh
-generate-api-platform-client https://demo.api-platform.com/ output/ --resource Book
+npx @api-platform/client-generator https://demo.api-platform.com/ output/ --resource Book
 ```
 
 **OpenAPI** (experimental)
 ```sh
-generate-api-platform-client https://demo.api-platform.com/docs.json output/ --resource Book --format swagger
+npx @api-platform/client-generator https://demo.api-platform.com/docs.json output/ --resource Book --format swagger
 ```
 
 ## Features