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/card-activity.php

@@ -0,0 +1,25 @@
+<?php
+/**
+ * Activity row (Browse By Activity). Args: $term (WP_Term).
+ */
+defined( 'ABSPATH' ) || exit;
+if ( empty( $term ) || ! is_object( $term ) ) {
+	return;
+}
+$link  = get_term_link( $term );
+$link  = is_wp_error( $link ) ? '#' : $link;
+$image = vc_term_image_url( $term->term_id, $term->taxonomy );
+$count = vc_term_tour_count( $term );
+?>
+<a class="vc-activity vc-reveal" href="<?php echo esc_url( $link ); ?>">
+	<span class="vc-activity__thumb">
+		<?php if ( $image ) : ?>
+			<img src="<?php echo esc_url( $image ); ?>" alt="<?php echo esc_attr( $term->name ); ?>" loading="lazy">
+		<?php else : ?>
+			<span class="vc-activity__thumb-ph" aria-hidden="true"></span>
+		<?php endif; ?>
+	</span>
+	<span class="vc-activity__name"><?php echo esc_html( $term->name ); ?></span>
+	<?php if ( $count ) : ?><span class="vc-activity__count"><?php echo esc_html( number_format_i18n( $count ) ); ?></span><?php endif; ?>
+	<span class="vc-activity__arrow" aria-hidden="true">&rsaquo;</span>
+</a>