[ADD] website_js_below_the_fold

[IMP] Description of the problem

[ADD] Copyright banner

website_js_below_the_fold/README.rst

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+.. image:: https://img.shields.io/badge/license-AGPL--3-blue.png
+   :target: https://www.gnu.org/licenses/agpl
+   :alt: License: AGPL-3
+
+=========================
+Website JS Below The Fold
+=========================
+
+This module moves Javascript assets to the bottom of the page (below the fold)
+preventing your website having render-blocking Javascript.
+
+When a visitor enters your website the browser will parse the HTML result.
+Whenever the parser encounters a script, it has to load and execute the script before it can continue parsing.
+So with render-blocking Javascript (e.g. in the head tag) the time to render the above the fold content increases.
+
+Without render-blocking Javascript (by e.g. loading it below the fold) the page first render occurs faster.
+This may result in various benefits e.g. lower bounce rate.
+
+More information:
+
+* `Render-blocking Javascript <https://developers.google.com/speed/docs/insights/BlockingJS>`_
+* `Above the fold <https://en.wikipedia.org/wiki/Above_the_fold>`_
+
+Usage
+=====
+
+This is a technical module and have no graphical interface whatsoever.
+
+.. image:: https://odoo-community.org/website/image/ir.attachment/5784_f2813bd/datas
+   :alt: Try me on Runbot
+   :target: https://runbot.odoo-community.org/runbot/186/11.0
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues
+<https://github.com/OCA/website/issues>`_. In case of trouble, please
+check there if your issue has already been reported. If you spotted it first,
+help us smash it by providing detailed and welcomed feedback.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Dennis Sluijk <[email protected]>
+
+Do not contact contributors directly about support or help with technical issues.
+
+Maintainer
+----------
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+This module is maintained by the OCA.
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+To contribute to this module, please visit https://odoo-community.org.

website_js_below_the_fold/__manifest__.py

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+# Copyright 2018 Onestein
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{
+    'name': 'Website JS Below The Fold',
+    'summary': 'This module moves Javascript assets '
+               'to the bottom of the page (below the fold)',
+    'category': 'Website',
+    'version': '11.0.1.0.0',
+    'author': 'Onestein, Odoo Community Association (OCA)',
+    'license': 'AGPL-3',
+    'website': 'https://github.com/OCA/website',
+    'depends': [
+        'website'
+    ],
+    'data': [
+        'templates/website_js_below_the_fold.xml'
+    ]
+}

website_js_below_the_fold/templates/website_js_below_the_fold.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2018 Onestein
+     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
+
+<odoo>
+    <template id="layout" inherit_id="website.layout">
+        <!-- Remove js -->
+        <xpath expr="//t[@t-call-assets='web.assets_common'][@t-css='false']" position="attributes">
+            <attribute name="t-js">false</attribute>
+        </xpath>
+        <xpath expr="//t[@t-call-assets='web.assets_frontend'][@t-css='false']" position="attributes">
+            <attribute name="t-js">false</attribute>
+        </xpath>
+        <xpath expr="//t[@t-call-assets='web_editor.summernote'][@t-css='false']" position="attributes">
+            <attribute name="t-js">false</attribute>
+        </xpath>
+        <xpath expr="//t[@t-call-assets='web_editor.assets_editor'][@t-css='false']" position="attributes">
+            <attribute name="t-js">false</attribute>
+        </xpath>
+        <xpath expr="//t[@t-call-assets='website.assets_editor'][@t-css='false']" position="attributes">
+            <attribute name="t-js">false</attribute>
+        </xpath>
+
+        <!-- When the is user a publisher add js to top of the page (below the fold is not relevant here) -->
+        <xpath expr="//t[@t-call-assets='website.assets_editor'][@t-css='false']" position="after">
+            <t groups="website.group_website_publisher">
+                <t t-call-assets="web.assets_common" t-css="false"/>
+                <t t-call-assets="web.assets_frontend" t-css="false"/>
+                <t t-call-assets="web_editor.summernote" t-css="false"/>
+                <t t-call-assets="web_editor.assets_editor" t-css="false"/>
+                <t t-call-assets="website.assets_editor" t-css="false"/>
+            </t>
+        </xpath>
+
+        <!-- Add to bottom of page -->
+        <xpath expr="//div[@id='wrapwrap']" position="after">
+            <t groups="!website.group_website_publisher">
+                <t t-call-assets="web.assets_common" t-css="false"/>
+                <t t-call-assets="web.assets_frontend" t-css="false"/>
+            </t>
+        </xpath>
+    </template>
+</odoo>