Josue, when I put this code to functions.php, the site goes down.
I used this

if ( !is_admin() ) {
	remove_action('wp_head','wp_print_scripts');
    remove_action('wp_head','wp_print_head_scripts',9);
    remove_action('wp_head','wp_enqueue_scripts',1);
    add_action('wp_footer','wp_print_scripts',5);
    add_action('wp_footer','wp_enqueue_scripts',5);
    add_action('wp_footer','wp_print_head_scripts',5);
	wp_deregister_script('jquery');
    wp_register_script('jquery', ("http://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"), false, '1.12.4', true);
    wp_enqueue_script('jquery');
}

but somehow it makes .css go to footer as well. Then I just commented this chunk in functions.php (and set up new minimized .css in header.php)

		//wp_register_style( 'avia-custom',  $template_url."/css/custom.css", array(), 	'2', 'all' );
																						 
		//wp_enqueue_style( 'avia-grid' ,   $template_url."/css/grid.css", array(), 		'2', 'all' );
		//wp_enqueue_style( 'avia-base' ,   $template_url."/css/base.css", array(), 		'2', 'all' );
		//wp_enqueue_style( 'avia-layout',  $template_url."/css/layout.css", array(), 	'2', 'all' );
		//wp_enqueue_style( 'avia-scs',     $template_url."/css/shortcodes.css", array(), '2', 'all' );
		//wp_enqueue_style( 'avia-popup-css', $template_url."/js/aviapopup/magnific-popup.css", array(), '1', 'screen' );
		//wp_enqueue_style( 'avia-media'  , $template_url."/js/mediaelement/skin-1/mediaelementplayer.css", array(), '1', 'screen' );
		//wp_enqueue_style( 'avia-print' ,  $template_url."/css/print.css", array(), '1', 'print' );

…and it helped. Now I’ve got scripts in my >footer>, styles in my >head> and normal headers without js.