Allow SVG Files Upload

Add support for SVG files to be uploaded in WordPress media.

add_filter('upload_mimes', function ($mimes) {
	if ( ! current_user_can('manage_options') ) return $mimes;
	$mimes['svg']  = 'image/svg+xml';
	$mimes['svgz'] = 'image/svg+xml';
	return $mimes;
});