message: add description tag in docs layout
diff: export let section;
  /** @type {string} */
  export let title;
  + /** @type {string} */
  + export let description;
  /** @type {string}*/
  export let subsection;
  <OpenGraph
  data={{
  - description: "Explore the documentation to learn more about Gitpod",
  title: title ? title : "Gitpod Documentation",
  + description: description
  + ? description
  + : "Explore the documentation to learn more about Gitpod",
  }}
  />
  <div class="flex">
  