[IMP] theme_bistro: adapt s_banner

Since the redesign of the original banner snippet, the customizations
made in theme_bistro have had to be adapted.

task-3097005

Part-of: odoo/design-themes#687

theme_bistro/views/images_library.xml

@@ -136,6 +136,16 @@
     <field name="name">website.s_banner_default_image</field>
     <field name="url">/theme_bistro/static/src/img/backgrounds/02.jpg</field>
 </record>
+<record id="s_banner_default_image_2" model="theme.ir.attachment">
+    <field name="key">website.s_banner_default_image_2</field>
+    <field name="name">website.s_banner_default_image_2</field>
+    <field name="url">/theme_bistro/static/src/img/backgrounds/20.jpg</field>
+</record>
+<record id="s_banner_default_image_3" model="theme.ir.attachment">
+    <field name="key">website.s_banner_default_image_3</field>
+    <field name="name">website.s_banner_default_image_3</field>
+    <field name="url">/theme_bistro/static/src/img/backgrounds/21.jpg</field>
+</record>
 
 <!-- Cover -->
 <record id="s_cover_default_image" model="theme.ir.attachment">

theme_bistro/views/snippets/s_banner.xml

@@ -4,12 +4,9 @@
 <template id="s_banner" inherit_id="website.s_banner">
     <!-- Section -->
     <xpath expr="section" position="attributes">
-        <attribute name="class" add="o_half_screen_height" remove="parallax s_parallax_is_fixed" separator=" "/>
-        <attribute name="data-scroll-background-ratio">0</attribute>
-        <attribute name="style">background-image: url('/web/image/website.s_banner_default_image'); background-position: 50% 0;</attribute>
+        <attribute name="class" add="o_cc o_cc5" separator=" "/>
         <attribute name="data-oe-shape-data">{"shape":"web_editor/Origins/09_001","flip":["x"]}</attribute>
     </xpath>
-    <xpath expr="//*[hasclass('s_parallax_bg')]" position="replace"/>
     <xpath expr="//*[hasclass('container')]" position="before">
         <div class="o_we_shape o_web_editor_Origins_09_001" style="background-image: url('/web_editor/shape/web_editor/Origins/09_001.svg?c3=o-color-2&amp;flip=x'); background-position: 50% 0%;"/>
     </xpath>