add_site_logo_to_index example

'home'            => home_url(),
            'gmt_offset'      => get_option( 'gmt_offset' ),
            'timezone_string' => get_option( 'timezone_string' ),
            'namespaces'      => array_keys( $this->namespaces ),
            'authentication'  => array(),
            'routes'          => $this->get_data_for_routes( $this->get_routes(), $request['context'] ),
        );

        $response = new WP_REST_Response( $available );
        $response->add_link( 'help', 'https://developer.wordpress.org/rest-api/' );
        $this->add_active_theme_link_to_index( $response );
        $this->add_site_logo_to_index( $response );
        $this->add_site_icon_to_index( $response );

        /** * Filters the REST API root index data. * * This contains the data describing the API. This includes information * about supported authentication schemes, supported namespaces, routes * available on the API, and a small amount of data about the site. * * @since 4.4.0 * @since 6.0.0 Added `$request` parameter. * * @param WP_REST_Response $response Response data. * @param WP_REST_Request $request Request data. */