Add "Login with Steady" as link to WP menu

functions.php

/**
 * For when you want the Steady login button as a proper link in your Wordpress menu.
 * Assumes that you have the Steady WP plugin installed https://wordpress.org/plugins/steady-wp/
 */

add_filter('wp_nav_menu_items', 'add_steady_login_menu_function', 10, 2);

function add_steady_login_menu_function( $nav, $args ) {
  // replace 'menu-location' with the name of your menu location
  // you can find all menu locations in the 'register_nav_menus' function in your functions.php 
  if( $args->theme_location == 'menu-location' ) {
    // putting together the link according to Steady integrations documentation
    // notice that here we put the link as first link in the menu, but you can swap the order of course
    return '<li><a class="steady-login-button" data-size="medium" data-language="en" style="display: none;"></a></li>'.$nav;
  }
  // if this is any other menu, we just return the menu
  return $nav;
}