Mélanger pages et articles

function sx_tags_categories_support() {
	register_taxonomy_for_object_type( 'post_tag', 'page' );
	register_taxonomy_for_object_type( 'category', 'page' );
}
add_action( 'init', 'sx_tags_categories_support' );

function sx_tags_categories_support_query( $wp_query ) {
	if ( $wp_query->get( 'tag' ) ) {
		$wp_query->set( 'post_type', array( 'post', 'page' ) );
	}
	if ( $wp_query->get( 'category_name' ) ) {
		$wp_query->set( 'post_type', array( 'post', 'page' ) );
	}
}
add_action( 'pre_get_posts', 'sx_tags_categories_support_query' );