simplify, update readme

README.md

@@ -22,6 +22,12 @@ A RabbitMQ instance is also required to send / receive messages when data has be
 
     Modify it if needed.
 
+- install the dependencies :
+
+    ```bash
+    npm install
+    ```
+    
 - start the containers :
 
     ```bash
@@ -30,12 +36,6 @@ A RabbitMQ instance is also required to send / receive messages when data has be
 
     The app runs automatically on port **5002**.
 
-- install the dependencies :
-
-    ```bash
-    npm install
-    ```
-
 ## Database migration
 
 Before using the app, you need to launch the database migration (it will be launched inside the container) :