Rebuilt (again...)

docs/index.html

@@ -63,6 +63,7 @@ <h3><strong>Important Notice</strong></h3>
 <p>We are currently working on <a href="https://github.com/PrismJS/prism/discussions/3531">Prism v2</a> and will only accept security-relevant PRs for the time being.</p>
 <p>Once work on Prism v2 is sufficiently advanced, we will accept PRs again. This will be announced on our <a href="https://github.com/PrismJS/prism/discussions">Discussion</a> page and mentioned in the <a href="https://github.com/PrismJS/prism/discussions/3531">roadmap discussion</a>.</p>
 <details>
+<summary>Prism v1 contributing notes</summary>
 <p>Prism depends on community contributions to expand and cover a wider array of use cases. If you like it, consider giving back by sending a pull request. Here are a few tips:</p>
 <ul>
 <li>Read the <a href="https://prismjs.com/extending.html">documentation</a>. Prism was designed to be extensible.</li>