[FIX] theme_*: fix s_text_cover design

This commit has two main goals:

1. Adapt the copy of the `s_text_cover` snippet to fit each theme

2. Introduce custom images for each themes, as the `s_text_cover` was
   always using the same image until now

This commit also fixes some conflicting classes due to a change of
`background-color` in the default snippet.

task-4119904
Part of task-3619705

Part-of: odoo/design-themes#919
Related: odoo/odoo#180736
Signed-off-by: Benjamin Vray (bvr) <bvr@odoo.com>
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

theme_enark/__manifest__.py

@@ -46,6 +46,7 @@
         'views/snippets/s_wavy_grid.xml',
         'views/snippets/s_shape_image.xml',
         'views/snippets/s_images_constellation.xml',
+        'views/snippets/s_text_cover.xml',
         'views/new_page_template.xml',
     ],
     'images': [

theme_enark/views/image_library.xml

@@ -330,5 +330,10 @@
     <field name="name">website.s_images_constellation_default_image_2</field>
     <field name="url">/theme_enark/static/src/img/snippets/s_images_constellation_default_image_2.jpg</field>
 </record>
+<record id="s_text_cover_default_image" model="theme.ir.attachment">
+    <field name="key">website.s_text_cover_default_image</field>
+    <field name="name">website.s_text_cover_default_image</field>
+    <field name="url">/theme_enark/static/src/img/snippets/library_image_02.jpg</field>
+</record>
 
 </odoo>

theme_enark/views/snippets/s_text_cover.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+
+<template id="s_text_cover" inherit_id="website.s_text_cover">
+    <!-- Section -->
+    <xpath expr="//section" position="attributes">
+        <attribute name="class" add="o_cc4" remove="o_cc3" separator=" "/>
+    </xpath>
+    <!-- Title -->
+    <xpath expr="//h1" position="replace" mode="inner">
+        Present your<br/>works. Easily.
+    </xpath>
+    <!-- Paragraph -->
+    <xpath expr="//p[hasclass('lead')]" position="replace" mode="inner">
+        <br/>Showcase your architectural designs online with a user-friendly platform that simplifies all the steps, from setup to project display, making it easy to highlight your work and attract potential clients.<br/>
+    </xpath>
+    <!-- Button -->
+    <xpath expr="//a[hasclass('btn')]/t" position="replace" mode="inner">
+        Get started
+    </xpath>
+</template>
+
+</odoo>