feat(main): Add base theme: This is the falcon theme out of the box.

This is falcon v3.1.2

falcon/templates/errors/maintenance.tpl

@@ -0,0 +1,61 @@
+{**
+ * Copyright since 2007 PrestaShop SA and Contributors
+ * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Academic Free License 3.0 (AFL-3.0)
+ * that is bundled with this package in the file LICENSE.md.
+ * It is also available through the world-wide-web at this URL:
+ * https://opensource.org/licenses/AFL-3.0
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@prestashop.com so we can send you a copy immediately.
+ *
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
+ * versions in the future. If you wish to customize PrestaShop for your
+ * needs please refer to https://devdocs.prestashop.com/ for more information.
+ *
+ * @author    PrestaShop SA and Contributors <contact@prestashop.com>
+ * @copyright Since 2007 PrestaShop SA and Contributors
+ * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License 3.0 (AFL-3.0)
+ *}
+{extends file='layouts/layout-error.tpl'}
+
+{block name='content'}
+
+  <section id="main">
+
+    {block name='page_header_container'}
+      <header class="page-header mb-2 text-center">
+        {block name='page_header_logo'}
+        <div class="logo"><img src="{$shop.logo}" alt="logo"></div>
+        {/block}
+
+        {block name='hook_maintenance'}
+          {$HOOK_MAINTENANCE nofilter}
+        {/block}
+
+        {block name='page_header'}
+          <h1>{block name='page_title'}{l s='We\'ll be back soon.' d='Shop.Theme.Global'}{/block}</h1>
+        {/block}
+      </header>
+    {/block}
+
+    {block name='page_content_container'}
+      <section id="content" class="page-content page-maintenance">
+        {block name='page_content'}
+          {$maintenance_text nofilter}
+        {/block}
+      </section>
+    {/block}
+
+    {block name='page_footer_container'}
+
+    {/block}
+
+  </section>
+
+{/block}