Update README.md

Author: adrw

README.md

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 <img src="https://raw.githubusercontent.com/cashapp/misk/master/misk.png" width="300"/>
 
+# Deprecation Warning
+
+Misk-Web is deprecated, please do not create new tabs and plan to migrate off long term.
+
+The Misk dashboard is migrating away from a React Typescript stack to using server-side-rendered kotlinx.html using Hotwire and Tailwind CSS.
+
+# Existing Readme Below
+
 See the [project website][docs] for documentation and APIs.
 
-[Misk-Web][repo] is a new micro-frontends Typescript + React web framework from Cash App.
+[Misk-Web][repo] is a micro-frontends Typescript + React web framework from Cash App.
 
 It also happens to work seamlessly with [Misk](https://github.com/cashapp/misk)!
 
-Misk-Web is still bleeding edge and may have breaking changes up until version `1.0.0`.
-
 ## Quick Links
 
 - [Building a Tab Guide](https://cashapp.github.io/misk-web/docs/guides/building-a-tab)