Set onBrokenAnchors and onBrokenMarkdownLinks to throw (#128)

- https://docusaurus.io/blog/releases/3.4
Can enforce that tags are either in the frontmatter or inline w/in
content
- https://docusaurus.io/blog/releases/3.3
	Prepares for React 19
- https://docusaurus.io/blog/releases/3.2
	Faster builds
	Faster dev server
MDX partials TOC (if you add headings via an MDX partial, they can be
included in the table of contents now)
- https://docusaurus.io/blog/releases/3.1
	Broken anchors checker

Author: jasikpark

docusaurus.config.cjs

@@ -15,7 +15,8 @@ const config = {
   baseUrl: '/',
   trailingSlash: true,
   onBrokenLinks: 'throw',
-  onBrokenMarkdownLinks: 'warn',
+  onBrokenMarkdownLinks: 'throw',
+  onBrokenAnchors: 'throw',
   favicon: 'img/favicon.ico',
 
   plugins: [