wp-logo+svg.php

<?php
/* -------------------------------------------------------------
 * Custom Logo add this in "after_setup_theme" hook
 * ============================================================*/ 
	add_theme_support( 'custom-logo' );
    
/* -------------------------------------------------------------
 * Enable svg support
 * ============================================================*/

if ( ! function_exists( 'avatar_add_svg_mime_types' ) ) {
	/**
	 * @param $mimes - MIME file type
	 * @return mixed
	 */
	function avatar_add_svg_mime_types( $mimes ) {

		if ( is_super_admin() ) {
			$mimes['svg'] = 'image/svg+xml';
		}
		return $mimes;
	}
	add_filter( 'upload_mimes', 'avatar_add_svg_mime_types' );
}