[IMP] theme_nano: update the theme

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

task-2590182

Part-of: odoo/design-themes#500

theme_nano/views/snippets/s_parallax.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+
+<template id="s_parallax" inherit_id="website.s_parallax">
+    <!-- Section -->
+    <xpath expr="//section" position="attributes">
+        <attribute name="class" add="pt48 pb48" separator=" "/>
+        <attribute name="data-oe-shape-data">{"shape":"web_editor/Rainy/10", "flip":["x","y"]}</attribute>
+    </xpath>
+    <xpath expr="//*[hasclass('oe_structure')]" position="before">
+        <div class="o_we_shape o_web_editor_Rainy_10 o_we_flip_x o_we_flip_y"/>
+    </xpath>
+    <!-- Content -->
+    <xpath expr="//*[hasclass('oe_structure')]" position="inside">
+        <section class="s_title pt40 pb40" data-vcss="001">
+            <div class="container s_allow_columns">
+                <h3 style="text-align: center;"><font class="bg-o-color-5">Feel free to come up with your big idea. <br/> We take care of the rest.</font></h3>
+            </div>
+        </section>
+    </xpath>
+</template>
+
+</odoo>