minor #11806 Remove an outdated article about Composer (javiereguiluz)

This PR was squashed before being merged into the 3.4 branch (closes #11806).

Discussion
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Remove an outdated article about Composer

This fixes #11798.

Commits
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f93d963 Remove an outdated article about Composer

Author: javiereguiluz

_build/redirection_map

@@ -366,3 +366,4 @@
 /workflow/usage /workflow
 /introduction/from_flat_php_to_symfony2 /introduction/from_flat_php_to_symfony
 /contributing/community/other /contributing/community
+/setup/composer /setup

contributing/code/tests.rst

@@ -18,7 +18,7 @@ Before Running the Tests
 
 To run the Symfony test suite, install the external dependencies used during the
 tests, such as Doctrine, Twig and Monolog. To do so,
-:doc:`install Composer </setup/composer>` and execute the following:
+`install Composer`_ and execute the following:
 
 .. code-block:: terminal
 
@@ -54,6 +54,7 @@ what's going on and if the tests are broken because of the new code.
     On Windows, install the `Cmder`_, `ConEmu`_, `ANSICON`_ or `Mintty`_ free applications
     to see colored test results.
 
+.. _`install Composer`: https://getcomposer.org/download/
 .. _Cmder: http://cmder.net/
 .. _ConEmu: https://conemu.github.io/
 .. _ANSICON: https://github.com/adoxa/ansicon/releases

create_framework/introduction.rst

@@ -86,7 +86,7 @@ Dependency Management
 
 To install the Symfony Components that you need for your framework, you are going
 to use `Composer`_, a project dependency manager for PHP. If you don't have it
-yet, :doc:`download and install Composer </setup/composer>` now.
+yet, `download and install Composer`_ now.
 
 Our Project
 -----------
@@ -113,3 +113,4 @@ introduce the HttpFoundation Component and see what it brings us.
 
 .. _`Symfony`: https://symfony.com/
 .. _`Composer`: http://packagist.org/about-composer
+.. _`download and install Composer`: https://getcomposer.org/download/

setup.rst

@@ -135,9 +135,8 @@ applications with `Composer`_, the dependency manager used by modern PHP
 applications.
 
 If you don't have Composer installed in your computer, start by
-:doc:`installing Composer globally </setup/composer>`. Then, execute the
-``create-project`` command to create a new Symfony application based on its
-latest stable version:
+`installing Composer`_. Then, execute the ``create-project`` command to create a
+new Symfony application based on its latest stable version:
 
 .. code-block:: terminal
 
@@ -315,11 +314,11 @@ Go Deeper with Setup
     setup/new_project_git
     setup/built_in_web_server
     setup/web_server_configuration
-    setup/composer
     setup/*
 
 .. _`Joyful Development with Symfony`: https://symfonycasts.com/screencast/symfony3
 .. _`Composer`: https://getcomposer.org/
+.. _`installing Composer`: https://getcomposer.org/download/
 .. _`Phar extension`: https://php.net/manual/en/intro.phar.php
 .. _`Symfony Standard Edition`: https://github.com/symfony/symfony-standard
 .. _`The Symfony Demo application`: https://github.com/symfony/demo

setup/composer.rst

@@ -8,8 +8,8 @@ Creating a New Project Based on an Unstable Symfony Version
 -----------------------------------------------------------
 
 Suppose that Symfony 2.7 version hasn't been released yet and you want to create
-a new project to test its features. First, :doc:`install the Composer </setup/composer>`
-package manager. Then, open a command console, enter your project's directory and
+a new project to test its features. First, `install the Composer package manager`_.
+Then, open a command console, enter your project's directory and
 execute the following command:
 
 .. code-block:: terminal
@@ -77,3 +77,5 @@ Symfony version has deprecated some of its features.
         # ... after testing the new Symfony version
         $ git checkout master
         $ git branch -D testing_new_symfony
+
+.. _`install the Composer package manager`: https://getcomposer.org/download/