minor #16532 Remove usage of SymfonyCloud in favor of Platform.sh (fabpot)

This PR was merged into the 4.4 branch.

Discussion
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Remove usage of SymfonyCloud in favor of Platform.sh

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Commits
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1632524 Remove usage of SymfonyCloud in favor of Platform.sh

Author: javiereguiluz

_build/redirection_map

@@ -132,11 +132,6 @@
 /cookbook/controller/upload_file /controller/upload_file
 /cookbook/debugging /
 /debug/debugging /
-/cookbook/deployment/azure-website /cookbook/azure-website
-/cookbook/deployment/fortrabbit /deployment/fortrabbit
-/cookbook/deployment/heroku /deployment/heroku
-/cookbook/deployment/index /deployment
-/cookbook/deployment/platformsh /deployment/platformsh
 /cookbook/deployment/tools /deployment/tools
 /cookbook/doctrine/common_extensions /doctrine/common_extensions
 /cookbook/doctrine/console /doctrine

_build/spelling_word_list.txt

@@ -113,7 +113,6 @@ filesystem
 filesystems
 formatter
 formatters
-fortrabbit
 frontend
 getter
 getters

deployment.rst

@@ -64,15 +64,8 @@ Using Platforms as a Service
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Using a Platform as a Service (PaaS) can be a great way to deploy your Symfony
-app quickly. There are many PaaS - below are a few that work well with Symfony:
-
-* `Symfony Cloud`_
-* `Heroku`_
-* `Platform.sh`_
-* `Azure`_
-* `fortrabbit`_
-* `Clever Cloud`_
-* `Scalingo`_
+app quickly. There are many PaaS, but we recommend `Platform.sh`_ as it
+provides a dedicated Symfony integration and help fund the Symfony development.
 
 Using Build Scripts and other Tools
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -275,12 +268,7 @@ Learn More
 .. _`Symfony plugin`: https://github.com/capistrano/symfony/
 .. _`Deployer`: https://deployer.org/
 .. _`Git Tagging`: https://git-scm.com/book/en/v2/Git-Basics-Tagging
-.. _`Heroku`: https://devcenter.heroku.com/articles/deploying-symfony4
-.. _`Platform.sh`: https://docs.platform.sh/frameworks/symfony.html
-.. _`Azure`: https://azure.microsoft.com/en-us/develop/php/
-.. _`fortrabbit`: https://help.fortrabbit.com/install-symfony-5
+.. _`Platform.sh`: https://symfony.com/cloud
 .. _`EasyDeployBundle`: https://github.com/EasyCorp/easy-deploy-bundle
-.. _`Clever Cloud`: https://www.clever-cloud.com/doc/php/tutorial-symfony/
 .. _`Symfony Cloud`: https://symfony.com/doc/master/cloud/intro.html
-.. _`Scalingo`: https://doc.scalingo.com/languages/php/symfony
 .. _`Symfony CLI`: https://symfony.com/download