message: Add beta label to TechDocs on homepage
  Adding a beta label and link to the TechDocs announcement post.
diff: @@ -306,7 +306,15 @@ class Index extends React.Component {
  src={`${baseUrl}animations/backstage-techdocs-icon-1.gif`}
  />
  - <Block.Subtitle>Backstage TechDocs</Block.Subtitle>
  + <Block.Subtitle>
  + Backstage TechDocs{' '}
  + <a
  + title="Submit feedback for this feature. Click to learn more about this release."
  + href="https://backstage.io/blog/2021/09/16/the-techdocs-beta-has-landed"
  + >
  + (beta)
  + </a>
  + </Block.Subtitle>
  <Block.Title small>Docs like code</Block.Title>
  </Block.TextBox>
  <Breakpoint
  