feat: announce Homarr v2 beta

apps/docs/docs/getting-started/index.mdx

@@ -11,6 +11,12 @@ tags:
 import Link from '@docusaurus/Link';
 import { IconArrowRight } from '@tabler/icons-react';
 
+:::info Homarr v2 beta is available
+
+There is no release date yet: Homarr v2 will become the default when it is ready. Read [what is new](https://v2.preview.homarr.dev/blog), try the [hosted preview](https://app-v2.preview.homarr.dev), [join us on Discord](https://discord.com/invite/aCsmEV5RgA), and [share your feedback](https://github.com/homarr-labs/homarr/issues/new?template=v2_beta_feedback.yml). Everyone uses Homarr differently, so every report helps us find what breaks or does not feel right before release.
+
+:::
+
 Before you try to install Homarr, please review if your device meets the requirements.
 Installing on an unsupported device may lead to unstable behaviour and no support will be provided.