All: Disable default styles that we don't use

These are newly introduced in WordPress 5.x and 6.x, as seen on the
stage sites today. Removing them now so we don't add unused styles
to the prod sites when we switch over to the new servers.

```
wp_dequeue_style('wp-block-library');
wp_dequeue_style('classic-theme-styles');
wp_dequeue_style('global-styles');
```

themes/jquery/functions.php

@@ -14,6 +14,16 @@
 	$content_width = 584;
 }
 
+add_action('init', function () {
+	// Remove unused stuff from wp_head
+	add_action('wp_enqueue_scripts', function () {
+		// Disable default styles that we don't use
+		wp_dequeue_style('wp-block-library');
+		wp_dequeue_style('classic-theme-styles');
+		wp_dequeue_style('global-styles');
+	});
+});
+
 add_action( 'after_setup_theme', function () {
 	// This theme styles the visual editor with editor-style.css to match the theme style.
 	add_editor_style();