[IMP] theme_bistro: revamp the theme

task-4178021
Part of task-4177975

closes odoo/design-themes#919

Related: odoo/odoo#180736
Signed-off-by: Outagant Mehdi (mou) <mou@odoo.com>
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

theme_bistro/views/snippets/s_image_title.xml

@@ -2,6 +2,17 @@
 <odoo>
 
 <template id="s_image_title" inherit_id="website.s_image_title">
+    <!-- Layout -->
+    <xpath expr="//section" position="attributes">
+        <attribute name="class" add="parallax" separator=" "/>
+        <attribute name="style"/>
+        <attribute name="data-scroll-background-ratio">-3</attribute>
+    </xpath>
+    <xpath expr="//div[hasclass('o_we_bg_filter')]" position="before">
+        <span class="s_parallax_bg oe_img_bg o_bg_img_center" style="background-image: url('/web/image/website.s_image_title_default_image') !important;"/>
+    </xpath>
+
+    <!-- Texts -->
     <xpath expr="//h1" position="replace" mode="inner">
         A Deep Dive into Flavor and Innovation
     </xpath>