minor #8764 removing a tiny chapter (weaverryan)

This PR was merged into the 4.0 branch.

Discussion
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removing a tiny chapter

The `usage.rst` was tiny. So I inlined it. It was also a pretty big wall of text, so I tried to simplify.

Commits
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af9f3fb removing a tiny chapter

Author: weaverryan

_build/redirection_map

@@ -122,7 +122,8 @@
 /cookbook/console/logging /console/logging
 /cookbook/console/request_context /console/request_context
 /cookbook/console/style /console/style
-/cookbook/console/usage /console/usage
+/cookbook/console/usage /console
+/console/usage /console
 /cookbook/controller/csrf_token_validation /controller/csrf_token_validation
 /cookbook/controller/error_pages /controller/error_pages
 /cookbook/controller/forwarding /controller/forwarding

console.rst

@@ -9,6 +9,16 @@ The Symfony framework provides lots of commands through the ``bin/console`` scri
 created with the :doc:`Console component </components/console>`. You can also
 use it to create your own commands.
 
+The Console: APP_ENV & APP_DEBUG
+---------------------------------
+
+Console commands run in the :ref:`environment <config-dot-env>` defined in the ``APP_ENV``
+variable of the ``.env`` file, which is ``dev`` by default. It also reads the ``APP_DEBUG``
+value to turn "debug" mode on or off (it defaults to ``1``, which is on).
+
+To run the command in another environment or debug mode, edit the value of ``APP_ENV``
+and ``APP_DEBUG``.
+
 Creating a Command
 ------------------