remove reference to Assetic

Author: xabbuh

frontend.rst

@@ -77,13 +77,6 @@ Full API
 
 * `Full API`_: https://github.com/symfony/webpack-encore/blob/master/index.js
 
-Assetic
--------
-
-Assetic is a pure PHP library that helps to process & optimize your assets (similar
-to Encore). Even though we recommend using Encore, Assetic still works great. For
-a comparison, see :doc:`/frontend/encore/versus-assetic`.
-
 For more about Assetic, see :doc:`/frontend/assetic`.
 
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