function hide_pages_from_admin($query) {
    global $pagenow, $post_type;
    if (is_admin() && $pagenow=='edit.php' && $post_type =='page') {
        $query->query_vars['post__not_in'] = array('ID_OF_PAGE_TO_HIDE');
    }
}
add_filter('parse_query', 'hide_pages_from_admin');

function additional_admin_color_schemes() {
  //Get the theme directory
  $theme_dir = get_template_directory_uri();

  //Ocean
  wp_admin_css_color( 'ocean', __( 'Ocean' ),
    $theme_dir . '/admin-colors/ocean/colors.min.css',
    array( '#aa9d88', '#9ebaa0', '#738e96', '#f2fcff' )
  );
}
add_action('admin_init', 'additional_admin_color_schemes');

function modify_footer_admin () {
  echo 'Created by YourName. Powered by <a href="http://WordPress.org">WordPress</a>.';
}
add_filter('admin_footer_text', 'modify_footer_admin');

add_action('wp_dashboard_setup', 'my_custom_dashboard_widgets');
function my_custom_dashboard_widgets() {
   global $wp_meta_boxes;
   wp_add_dashboard_widget('custom_help_widget', 'Theme Support', 'custom_dashboard_help');
}
function custom_dashboard_help() {
   echo '<p>Welcome to your custom dashboard! Need help? Contact the support here.</p>';
}