[IMP] theme_graphene: adapt s_banner

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

task-3097005

Part-of: odoo/design-themes#687

theme_graphene/views/customizations.xml

@@ -30,13 +30,6 @@
     </xpath>
 </template>
 
-<!-- ======== BANNER ======== -->
-<template id="s_banner" inherit_id="website.s_banner" name="Graphene s_banner">
-    <xpath expr="//a[hasclass('btn')]" position="attributes">
-        <attribute name="class" add="btn-lg" separator=" "/>
-    </xpath>
-</template>
-
 <!-- ======== TEXT-IMAGE ======== -->
 <template id="s_text_image" inherit_id="website.s_text_image" name="Graphene s_text_image">
     <xpath expr="//section" position="attributes">

theme_graphene/views/images_library.xml

@@ -126,6 +126,16 @@ Check in images.scss, primary_variables.scss, main.scss and theme_common's mixin
     <field name="name">website.s_banner_default_image</field>
     <field name="url">/theme_graphene/static/src/img/pictures/content_01.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_graphene/static/src/img/pictures/content_24.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_graphene/static/src/img/pictures/content_25.jpg</field>
+</record>
 
 <!-- Pop Up -->
 <record id="s_popup_default_image" model="theme.ir.attachment">