feat: announce Homarr v2 beta (#6793)

* feat: announce Homarr v2 beta

* chore: refine v2 beta announcement

* feat: expand v2 beta guidance

* chore: refine v2 beta resources

* chore: simplify v2 beta modal

* chore: improve v2 beta feedback links

* fix: keep v2 modal above header

* chore: sharpen v2 beta message

* fix: clear header for v2 modal

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
+
+We've been working on Homarr's v2 update for a while now. There is no fixed release date yet, it will be ready when it's ready. We **need your help** and feedback to help us become confident enough to release it for everyone. Read [what is new](https://v2.preview.homarr.dev/blog/2026/09/03/homarr-2.0), browse the [v2 documentation](https://v2.preview.homarr.dev/docs/getting-started/) and [Workshop](https://v2.preview.homarr.dev/workshop), or try the [hosted preview](https://app-v2.preview.homarr.dev). If anything breaks or does not feel right, [tell us on Discord](https://discord.com/invite/aCsmEV5RgA) in the dedicated v2 channel for the fastest response, or [open a dedicated GitHub issue](https://github.com/homarr-labs/homarr/issues/new?template=v2_beta_feedback.yml). SQLite administrators can download a full backup directly from the beta announcement before changing images.
+
+:::
+
 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.