chore: export MdxEditor from lib stateless exports

Author: wkylin

src/lib/stateless.ts

@@ -89,6 +89,7 @@ export { default as PointerMove } from '../components/stateless/PointerMove'
 export { default as RadioInput } from '../components/stateless/RadioInput'
 export { ReactSignature } from '../components/stateless/ReactSignature'
 export { default as ReMarkdown } from '../components/stateless/ReMarkdown'
+export { default as MdxEditor } from '../components/stateless/MdxEditor'
 export { default as SafeLink } from '../components/stateless/SafeLink'
 export { default as SandpackBasic } from '../components/stateless/SandpackBasic'
 export { default as ScratchToReveal } from '../components/stateless/ScratchToReveal'