website/_includes/version-with-upgrade-notice.html

<div class="alert alert-warning news-container-alert mt-4">
  <a class="news-overlay" href="https://yarnpkg.com/getting-started/migration#why-should-you-migrate"></a>
  <div class="news-inner">
    <div>
      These instructions only cover Yarn versions prior to 2.0. Those versions entered <a href="https://en.wikipedia.org/wiki/Maintenance_mode">maintenance mode</a> in January 2020 and will eventually reach their end-of-life in terms of support. Please see the main website for the most up-to-date documentation: <a href="https://yarnpkg.com/getting-started/migration#why-should-you-migrate">yarnpkg.com/getting-started/migration</a>.
    </div>
    <div style="margin-top: 15px">
      The latest Yarn version is: <img alt="Latest CLI Release" src="https://img.shields.io/npm/v/@yarnpkg/cli/latest?label=latest">
    </div>
  </div>
</div>

{% include version.html %}