[IMP] theme_*: adapt s_split_intro snippet

*: anelusia, artists, avantgarde, aviato, beauty, bewise, bistro,
bookstore, buzzy, cobalt, enark, kiddo, loftspace, monglia, nano, notes,
odoo_experts, orchid, real_estate, treehouse, vehicle, yes, zap.

This commit reviews the occurrences of `s_split_intro` snippet across
design themes.

task-4077616
part of task-4077427

closes odoo/design-themes#876

Related: odoo/odoo#175321
Signed-off-by: Christopher du Toit (chto) <chto@odoo.com>

theme_bistro/views/images_library.xml

@@ -605,4 +605,11 @@
     <field name="url">/theme_bistro/static/src/img/backgrounds/19.jpg</field>
 </record>
 
+<!-- Split intro -->
+<record id="s_split_intro_default_image" model="theme.ir.attachment">
+    <field name="key">website.s_split_intro_default_image</field>
+    <field name="name">website.s_split_intro_default_image</field>
+    <field name="url">/theme_bistro/static/src/img/content/s_split_intro_default_image.jpg</field>
+</record>
+
 </odoo>

theme_bistro/views/snippets/s_split_intro.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+
+<template id="s_split_intro" inherit_id="website.s_split_intro">
+    <!-- Section -->
+    <xpath expr="//section" position="attributes">
+        <attribute name="class" add="o_cc4" remove="o_cc1" separator=" "/>
+    </xpath>
+    <!-- Left column -->
+    <xpath expr="//h1" position="replace" mode="inner">
+        Savor the art<br/>of casual dining
+    </xpath>
+    <xpath expr="//p" position="replace" mode="inner">
+        <br/>Indulge in a dining experience where flavor meets comfort. At our bistro, we blend fresh ingredients with culinary creativity to offer a menu that delights every palate. Whether you're here for a quick bite or a leisurely meal, our welcoming atmosphere and delicious dishes make every visit special.<br/><br/>
+    </xpath>
+</template>
+
+</odoo>