Update docs/getting-started.md

Co-authored-by: Michael Novotny <manovotny@gmail.com>

docs/getting-started.md

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 description: Get started with Next.js in the official documentation, and learn more about all our features!
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-> Next.js 13 was recently released, [learn more](https://nextjs.org/blog/next-13) and see the [upgrade guide](https://nextjs.org/docs/upgrading#upgrading-from-12-to-13). Version 13 also introduces beta features like the `app` directory that works alongside the `pages` directory (stable) for incremental adoption. You can continue using `pages` in Next.js 13, but if you want to try the new `app` features, [see the new beta docs](https://beta.nextjs.org/docs). 
+> Next.js 13 was recently released, [learn more](https://nextjs.org/blog/next-13) and see the [upgrade guide](https://nextjs.org/docs/upgrading#upgrading-from-12-to-13). Version 13 also introduces beta features like the [`app` directory](https://beta.nextjs.org/docs/app-directory-roadmap) that works alongside the `pages` directory (stable) for incremental adoption. You can continue using `pages` in Next.js 13, but if you want to try the new `app` features, [see the new beta docs](https://beta.nextjs.org/docs). 
 
 # Getting Started