minor #8750 Updated frontend/* articles to Symfony 4 (javiereguiluz)

This PR was squashed before being merged into the 4.0 branch (closes #8750).

Discussion
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Updated frontend/* articles to Symfony 4

This fixes #8723.

Commits
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440e767 Removed Assetic DIC tags
63eb6d6 Minor changes
4545905 Fixed non-existent reference
d898d02 Removed another deprecated article
d551fe5 Updated frontend/* articles to Symfony 4

Author: weaverryan

_build/redirection_map

@@ -355,6 +355,13 @@
 /event_dispatcher/class_extension /event_dispatcher
 /form /forms
 /form/use_virtual_forms /form/inherit_data_option
+/frontend/assetic/apply_to_option /frontend/assetic
+/frontend/assetic/asset_management /frontend/assetic
+/frontend/assetic/jpeg_optimize /frontend/assetic
+/frontend/assetic/php /frontend/assetic
+/frontend/assetic/uglifyjs /frontend/assetic
+/frontend/assetic/yuicompressor /frontend/assetic
+/reference/configuration/assetic /frontend/assetic
 /security/target_path /security
 /service_container/third_party /service_container
 /templating/templating_service /templates

assetic/_standard_edition_warning.rst.inc

@@ -29,7 +29,6 @@ features.
 
 Next: :doc:`/best_practices/tests`
 
-.. _`official Assetic documentation`: https://github.com/kriswallsmith/assetic
 .. _`Webpack Encore`: https://github.com/symfony/webpack-encore
 .. _`Webpack`: https://webpack.js.org/
 .. _`official Webpack Encore documentation`: https://symfony.com/doc/current/frontend.html

best_practices/web-assets.rst

@@ -1,10 +1,8 @@
 Assetic
 =======
 
-.. include:: /assetic/_standard_edition_warning.rst.inc
+.. caution::
 
-.. toctree::
-    :maxdepth: 1
-    :glob:
-
-    assetic/*
+    Using Assetic to manage web assets in Symfony applications is no longer
+    recommended. Instead, use :doc:`Webpack Encore </frontend>`, which bridges
+    Symfony apps with modern JavaScript-based tools to manage web assets.