Update setup steps

README.md

@@ -14,7 +14,8 @@ For end-user documentation, see the home page of an instance of your choice.
 1. Install PHP.
 2. Install PHP's cURL and XML extensions.
 3. Clone the repository and its submodules.
-4. Point your server to `pages`.
+4. Adapt `config/config.php`.
+5. Point your server to `pages`.
 
 ## License