build(website): Fail the build on broken anchors

Signed-off-by: Martin Nonnenmacher <[email protected]>

Author: mnonnenmacher

website/docusaurus.config.js

@@ -23,6 +23,7 @@ const config = {
   projectName: 'ort', // Usually your repo name.
   trailingSlash: false,
 
+  onBrokenAnchors: 'throw',
   onBrokenLinks: 'throw',
   onBrokenMarkdownLinks: 'throw',