feat: Blog Markup

[marcobiedermann]

Since posts are a collection of items that are sorted/ordered by date, they should be rendered as an ordered list in order to improve the page structure which will help search engines and screen readers to interpreter the content.

<ol>
  <li>
    <article>…</article>
  </li>
</ol>

[gatsbot]

Hey, @marcobiedermann

Thank you for your pull request!

This repo is now a read-only repo that's synced from the main Gatsby monorepo at https://github.com/gatsbyjs/gatsby/.

We've moved all our starters to https://github.com/gatsbyjs/gatsby/tree/master/starters so changes to starters are made there.

Please checkout our contribution docs & recreate your PR against the starter directory in monorepo.

https://www.gatsbyjs.org/contributing/how-to-open-a-pull-request/

Thanks again!

Generated by 🚫 dangerJS

[marcobiedermann]

Moved to gatsbyjs/gatsby#26601