SANGOのトップページにカスタム投稿タイプのサムネイル付き記事一覧を表示させる

<h3 class="center strong top-title"><i class="fa fa-thumb-tack fa-fw"></i>　カスタム投稿タイプ</h3>
<div class="cardtype cf">
<?php
/* カスタム投稿タイプ記事一覧 */
$paged = (int) get_query_var('paged');
$args = array(
	'posts_per_page' => 6,
	'paged' => $paged,
	'orderby' => 'post_date',
	'order' => 'DESC',
	'post_type' => 'custom_blog',
	'post_status' => 'publish'
);
$the_query = new WP_Query($args);
if ( $the_query->have_posts() ) :
	while ( $the_query->have_posts() ) : $the_query->the_post();
?>

<article class="cardtype__article">
    <a class="cardtype__link" href="<?php the_permalink()?>">
        <?php
$cat = get_the_category();
$cat = $cat[0];
?>
      <p class="cardtype__img">
        <img src="<?php echo featured_image_src('thumb-520'); ?>" alt="<?php the_title();?>">
      </p>
      <div class="cardtype__article-info">
        <?php if (!get_option('remove_pubdate')): ?>
        <time class="updated entry-time dfont" datetime="<?php the_time('Y-m-d');?>"><?php echo get_post_time('Y.m.d D'); ?></time>
        <?php endif;?>
        <h2><?php the_title();?></h2>
      </div>
    </a>
</article>
<?php endwhile; endif; ?>
</div>
<nav class="pagination dfont">
<?php
if ($the_query->max_num_pages > 1) {
	echo paginate_links(array(
      'base' => get_pagenum_link(1) . '%_%',
      'format' => 'page/%#%/',
      'current' => max(1, $paged),
      'total' => $the_query->max_num_pages,
      'end_size' => 1,
      'mid_size' => 1,
      'prev_text' => '<i class="fa fa-chevron-left"></i>',
      'next_text' => '<i class="fa fa-chevron-right"></i>',
      'type' => 'list'
	));
}
?>
</nav>
<?php wp_reset_postdata(); ?>