message: fix(docs-infra): do not create an anchor for the `file-not-found` header
  PR Close
diff: <div class="nf-container l-flex-wrap flex-center">
  <img src="assets/images/support/angular-404.svg" width="300" height="300"/>
  <div class="nf-response l-flex-wrap">
  - <h1 class="no-toc">Page Not Found</h1>
  + <h1 class="no-anchor no-toc">Page Not Found</h1>
  <p>We're sorry. The page you are looking for cannot be found.</p>
  </div>
  </div>
  