Remove some of WordPress's junk

snip.php

<?php
function disable_wp_unwanted_stuff() {
  // remove emoji js junk
  remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
  remove_action( 'wp_print_styles', 'print_emoji_styles' );
  wp_deregister_script( 'wp-embed' );

  // Remove the REST API endpoint.
  remove_action('rest_api_init', 'wp_oembed_register_route');

  // Turn off oEmbed auto discovery.
  // Don't filter oEmbed results.
  remove_filter('oembed_dataparse', 'wp_filter_oembed_result', 10);

  // Remove oEmbed discovery links.
  remove_action('wp_head', 'wp_oembed_add_discovery_links');

  // Remove oEmbed-specific JavaScript from the front-end and back-end.
  remove_action('wp_head', 'wp_oembed_add_host_js');
  
  remove_action('wp_head', 'wp_print_scripts');
	remove_action('wp_head', 'wp_print_head_scripts', 9);
	remove_action('wp_head', 'wp_enqueue_scripts', 1);
}

// there's probably a better place than init for these...
add_action( 'init', 'disable_wp_unwanted_stuff' );

/* tidy up nav li items */
function trimmed_classes($classes, $item){
     return [];
}
add_filter('nav_menu_css_class' , 'trimmed_classes' , 10 , 2);