[REF] website: simple move of a python file

Next commit will change that file to make it extend a web_editor model
instead of a web_editor controller. This commit only moves the file.

PR https://github.com/odoo/odoo/pull/29624
task-1904244

addons/website/controllers/__init__.py

@@ -3,4 +3,3 @@
 
 from . import backend
 from . import main
-from . import web_editor

addons/website/models/__init__.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
+from . import assets
 from . import ir_actions
 from . import ir_attachment
 from . import ir_http