[IMP] theme_artists: update the theme

This commit updates the theme to improve the design with new colors, new
pictures and new snippet customizations.

task-2580170

Part-of: odoo/design-themes#500

theme_artists/views/snippets/s_picture.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+
+<template id="s_picture" inherit_id="website.s_picture">
+    <!-- Section -->
+    <xpath expr="//section" position="attributes">
+        <attribute name="class" add="o_cc5" remove="o_cc2" separator=" "/>
+    </xpath>
+    <!-- Image -->
+    <xpath expr="//img" position="attributes">
+        <attribute name="class" remove="img-thumbnail" separator=" "/>
+        <attribute name="style">width: 100%;</attribute>
+    </xpath>
+</template>
+
+</odoo>