Register the ht_kb custom post type

ht-knowledge-base.php

   /**
		* Register the ht_kb custom post type
		*/
		function register_ht_knowledge_base_cpt(){

			if(apply_filters('ht_kb_disable_ht_kb_cpt', false)){
				return;
			}

			$singular_item = _x('Article', 'Post Type Singular Name', 'ht-knowledge-base');
			$plural_item = _x('Articles', 'Post Type Plural Name', 'ht-knowledge-base');
			$kb_item = __('Knowledge Base', 'ht-knowledge-base');
			$rewrite = $this->get_cpt_slug();
			$show_in_rest = apply_filters('ht_kb_show_in_rest', true);
			$rest_base = apply_filters('ht_kb_rest_base', 'ht-kb');
			$has_archive = apply_filters('ht_kb_cpt_has_archive', true);

		  	$labels = array(
			    'name'	      		 => $plural_item,
			    'singular_name'      => $singular_item,
			    'add_new'            => __('Add New', 'ht-knowledge-base') . ' ' .  $singular_item,
			    'add_new_item'       => __('Add New', 'ht-knowledge-base') . ' ' .  $singular_item,
			    'edit_item'          => __('Edit', 'ht-knowledge-base') . ' ' .  $singular_item,
			    'new_item'           => __('New', 'ht-knowledge-base') . ' ' .  $singular_item,
			    'all_items'          => __('All', 'ht-knowledge-base') . ' ' .  $plural_item,
			    'view_item'          => __('View', 'ht-knowledge-base') . ' ' .  $singular_item,
			    'search_items'       => __('Search', 'ht-knowledge-base') . ' ' .  $plural_item,
			    'not_found'          => sprintf( __( 'No %s found', 'ht-knowledge-base' ), $plural_item ),
			    'not_found_in_trash' => sprintf( __( 'No %s found in trash', 'ht-knowledge-base' ), $plural_item ),
			    'parent_item_colon'  => '',
			    'menu_name'          => $kb_item,
		  	);

			$args = array(
				'labels'             => $labels,
				'public'             => true,
				'publicly_queryable' => true,
				'show_ui'            => true,
				'show_in_menu'       => true,
				'show_in_nav_menus'	 => true,
				'query_var'          => true,
				'rewrite'            => array( 'slug' => $rewrite, 'with_front'	=>	false ),
				'capability_type'    => 'post',
				'has_archive'        => $has_archive,
				'hierarchical'       => false,
				'show_in_rest'       => $show_in_rest,
				'rest_base'          => $rest_base,
				'menu_icon'			 => 'dashicons-lightbulb',
				'menu_position'      => null,
				'supports'           => apply_filters( 'ht_kb_cpt_supports', array( 'title', 'editor', 'author', 'comments', 'post-formats', 'custom-fields', 'revisions', 'publicize', 'wpcom-markdown', 'excerpt' ) )
			);

		  register_post_type( 'ht_kb', $args );
		}