bookmarks.php

<?php

/**
 * Modify likes' URLs, and add tagging.
 */
add_action( 'register_post_type_args', function( $args, $post_type ) {
	if ( 'indieblocks_like' === $post_type ){
		$args['rewrite']['slug'] = 'bookmarks'; // The new slug.
	}

	$args['taxonomies'] = array( 'post_tag' ); // Allow likes to be tagged. We're using the default "post" tags rather than a custom taxonomy.

	return $args;
}, 99, 2 );


/**
 * Modify likes' default template.
 */
add_action( 'init', function() {
	$post_type_object = get_post_type_object( 'indieblocks_like' );

	if ( ! $post_type_object ) {
		// Post type not active.
		return;
	}

	$post_type_object->template = array(
		array(
			'indieblocks/bookmark',
			array(),
			array( array( 'core/paragraph' ) ),
		),
	);
}, 99 );

Turns the IndieBlocks' "like" CPT into more of a "bookmark" CPT. Make sure to visit Settings > Permalinks afterward!