fix: fail build on broken links (ory#734)

Closes ory#731

Author: aeneasr

docusaurus.config.js

@@ -58,8 +58,8 @@ module.exports = {
   url: `https://www.ory.sh`,
   baseUrl: '/docs/',
   favicon: 'img/favico.png',
-  onBrokenLinks: 'error',
-  onBrokenMarkdownLinks: 'error',
+  onBrokenLinks: 'throw',
+  onBrokenMarkdownLinks: 'throw',
   onDuplicateRoutes: 'error',
   organizationName: 'ory',
   projectName: 'docs',