index: Reword now that we're out of preview

Move the Note to the bottom and remove "preview" related warnings.

modules/ROOT/pages/index.adoc

@@ -1,15 +1,6 @@
 :experimental:
 = Fedora CoreOS Documentation
 
-Welcome to the Fedora CoreOS documentation!
-
-[NOTE]
-====
-This site and project are currently very dynamic and will change a lot within the next weeks and months.
-Please refer to the xref:faq.adoc[FAQ] for more information for the time being.
- If you want to help or ask any questions, join the link:irc://irc.freenode.org/#fedora-coreos[IRC channel], or join our new link:https://discussion.fedoraproject.org/c/server/coreos[discussion board].
-====
-
 image::welcomefedoracoreos.jpg[]
 
 Fedora CoreOS is an automatically updating, minimal, monolithic, container-focused operating system, designed for clusters but also operable standalone, optimized for Kubernetes but also great without it.
@@ -19,4 +10,10 @@ Its goal is to provide the best container host to run containerized workloads se
 Fedora CoreOS is an open source project associated with the link:https://fedoraproject.org/[Fedora Project].
 We are aiming for high compatibility with existing Container Linux configuration and user experience, and we expect to provide documentation and tooling to help migrate from Container Linux to Fedora CoreOS.
 
+[NOTE]
+====
+Please refer to the xref:faq.adoc[FAQ] for more information.
+If you want to help or ask any questions, join the link:irc://irc.freenode.org/#fedora-coreos[IRC channel], or join our link:https://discussion.fedoraproject.org/c/server/coreos[discussion board].
+====
+
 xref:getting-started.adoc[Get started using Fedora CoreOS!]