CHANGE
$args = array('post_type' => 'post',
'posts_per_page' => $nr_posts,
'order' => 'DESC',
'orderby' => 'date',
'post_status' => 'publish'
);
To
$args = array('post_type' => array('post','page'),
'posts_per_page' => $nr_posts,
'order' => 'DESC',
'orderby' => 'date',
'post_status' => 'publish'
);
Refer here for more WP QUERY