Add viator-collector plugin (Hop On Hop Off front-end reskin)

Consolidate the plugin into the TourWebsite repository (its separate
nested git repo has been removed). Includes the full new-design reskin:
scoped design stylesheet, SVG icon sprite, rebuilt listing/single/section
templates, and homepage hero/FAQ/testimonials shortcodes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J4hNL1PSHxXbu94SCenpKj

viator-collector/templates/archive-viator_tour.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * Post-type archive for viator_tour — renders the shared listing UI.
+ */
+defined( 'ABSPATH' ) || exit;
+get_header();
+?>
+<main class="vc-app vc-listing">
+	<?php
+	echo vc_get_template( // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+		'listing.php',
+		array(
+			// Deliberately location-agnostic; override with the vc_listing_title filter.
+			'vc_title'       => __( 'Explore Tours & Experiences', 'viator-collector' ),
+			'vc_subtitle'    => __( 'Find the best tours, activities and unforgettable experiences.', 'viator-collector' ),
+			'vc_crumb_label' => __( 'Tours', 'viator-collector' ),
+		)
+	);
+	?>
+</main>
+<?php
+get_footer();