minor #8538 Remove Debugging Guide (weaverryan)

This PR was merged into the master branch.

Discussion
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Remove Debugging Guide

In 3.4, the debugging article has details about `bootstrap.php.cache`, etc. But in 4 (as you can see), it has almost nothing! I think we should remove it (and remove the Guide link on Symfony.com for version 4). The individual `debug:` commands should be documented in those sections - nobody will click "Debug" so they can learn about how to debug something specific (e.g. translations).

Cheers!

Commits
-------

acdc22a no more debugging

Author: weaverryan

_build/redirection_map

@@ -127,7 +127,8 @@
 /cookbook/controller/index /controller
 /cookbook/controller/service /controller/service
 /cookbook/controller/upload_file /controller/upload_file
-/cookbook/debugging /debug/debugging
+/cookbook/debugging /
+/debug/debugging /
 /cookbook/deployment/azure-website /cookbook/azure-website
 /cookbook/deployment/fortrabbit /deployment/fortrabbit
 /cookbook/deployment/heroku /deployment/heroku

configuration/front_controllers_and_kernel.rst

@@ -45,7 +45,6 @@ to `decorate`_ the kernel with additional features. Examples include:
 * Configuring the autoloader or adding additional autoloading mechanisms;
 * Adding HTTP level caching by wrapping the kernel with an instance of
   :ref:`AppCache <symfony-gateway-cache>`;
-* Enabling (or skipping) the :doc:`ClassCache </debug/debugging>`;
 * Enabling the :doc:`Debug Component </components/debug>`.
 
 The front controller can be chosen by requesting URLs like:

debug.rst

@@ -40,7 +40,6 @@ Topics
     bundles
     console
     doctrine
-    debug
     deployment
     email
     event_dispatcher