Moved logging tutorials

Author: javiereguiluz

cookbook/logging/channels_handlers.rst renamed to logging/channels_handlers.rst

@@ -159,4 +159,9 @@
 /cookbook/form/unit_testing /form/unit_testing
 /cookbook/form/use_empty_data /form/use_empty_data
 /cookbook/frontend/bower /frontend/bower
-/cookbook/install/unstable_versions /install/unstable_versions
+/cookbook/install/unstable_versions /install/unstable_versions
+/cookbook/logging/channels_handlers /logging/channels_handlers
+/cookbook/logging/monolog /logging/monolog
+/cookbook/logging/monolog_console /logging/monolog_console
+/cookbook/logging/monolog_email /logging/monolog_email
+/cookbook/logging/monolog_regex_based_excludes /logging/monolog_regex_based_excludes