storey: callout about storey being a prototype

src/pages/storey.mdx

@@ -2,6 +2,8 @@
 tags: ["storey"]
 ---
 
+import { Callout } from "nextra/components";
+
 # Introduction
 
 [Storey](https://docs.rs/cw-storey/latest/cw_storey/) is an alternative to
@@ -13,11 +15,13 @@ software does.
 While StoragePlus has been around for years and is the established way of
 storing your data on-chain, Storey is the new kid on the block.
 
+<Callout type="warning">
 Storey is currently **prototype software**, meaning the API might change
 rapidly, **storage layout might break between versions**, and you might stumble
 into bugs and missing features. It's probably a good idea not to use it for
 serious production software just yet. If you do, please keep in mind the
 increased maintenance burden and be careful!
+</Callout>
 
 On the other hand, it is a solution we want to move toward - we appreciate
 anyone willing to help us test it. We also appreciate feedback, feature