Remove unneccessary things from WordPress.md

Remove emojis!

Newer solution

/**
 * Disable the emoji's
 */
function disable_emojis() {
	remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
	remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
	remove_action( 'wp_print_styles', 'print_emoji_styles' );
	remove_action( 'admin_print_styles', 'print_emoji_styles' );
	remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
	remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );
	remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
	add_filter( 'tiny_mce_plugins', 'disable_emojis_tinymce' );
	add_filter( 'wp_resource_hints', 'disable_emojis_remove_dns_prefetch', 10, 2 );
  }
  add_action( 'init', 'disable_emojis' );

  /**
	* Filter function used to remove the tinymce emoji plugin.
	*
	* @param array $plugins
	* @return array Difference betwen the two arrays
	*/
   function disable_emojis_tinymce( $plugins ) {
	if ( is_array( $plugins ) ) {
	return array_diff( $plugins, array( 'wpemoji' ) );
	} else {
	return array();
	}
  }
 
  /**
	* Remove emoji CDN hostname from DNS prefetching hints.
	*
	* @param array $urls URLs to print for resource hints.
	* @param string $relation_type The relation type the URLs are printed for.
	* @return array Difference betwen the two arrays.
	*/
  function disable_emojis_remove_dns_prefetch( $urls, $relation_type ) {
	if ( 'dns-prefetch' == $relation_type ) {
	/** This filter is documented in wp-includes/formatting.php */
	$emoji_svg_url = apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/2/svg/' );

  $urls = array_diff( $urls, array( $emoji_svg_url ) );
	}

  return $urls;
  }

Older solution

/**
 * Disable emoji's
 *
 */

function disable_emoji_feature() {

	// Prevent Emoji from loading on the front-end
	remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
	remove_action( 'wp_print_styles', 'print_emoji_styles' );

	// Remove from admin area also
	remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
	remove_action( 'admin_print_styles', 'print_emoji_styles' );

	// Remove from RSS feeds also
	remove_filter( 'the_content_feed', 'wp_staticize_emoji');
	remove_filter( 'comment_text_rss', 'wp_staticize_emoji');

	// Remove from Embeds
	remove_filter( 'embed_head', 'print_emoji_detection_script' );

	// Remove from emails
	remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );

	// Disable from TinyMCE editor. Currently disabled in block editor by default
	add_filter( 'tiny_mce_plugins', 'disable_emojis_tinymce' );

	/** Finally, prevent character conversion too
         ** without this, emojis still work
         ** if it is available on the user's device
	 */

	add_filter( 'option_use_smilies', '__return_false' );

}

function disable_emojis_tinymce( $plugins ) {
	if( is_array($plugins) ) {
		$plugins = array_diff( $plugins, array( 'wpemoji' ) );
	}
	return $plugins;
}

add_action('init', 'disable_emoji_feature');

//Remove JQuery migrate

function remove_jquery_migrate( $scripts ) {
   if ( ! is_admin() && isset( $scripts->registered['jquery'] ) ) {
        $script = $scripts->registered['jquery'];
		if ( $script->deps ) {
	// Check whether the script has any dependencies

			$script->deps = array_diff( $script->deps, array( 'jquery-migrate' ) );
 		}
 	}
}
add_action( 'wp_default_scripts', 'remove_jquery_migrate' );