Blocks: Remove Chapter List (#539)

* Blocks: Remove Chapter List

This block has been moved to wporg-mu-plugins.

* Remove styles from theme.json

Author: ryelle

source/wp-content/themes/wporg-developer-2023/functions.php

@@ -150,7 +150,6 @@
 require __DIR__ . '/inc/block-hooks.php';
 
 // Block files
-require_once __DIR__ . '/src/chapter-list/block.php';
 require_once __DIR__ . '/src/cli-command-table/block.php';
 require_once __DIR__ . '/src/code-changelog/block.php';
 require_once __DIR__ . '/src/code-deprecated/block.php';