Fluent docs README new repo for updates

Author: MarcusWentz

README.md

@@ -1,4 +1,8 @@
-# fluent-mdbook-test
+⚠️ Note: Fluent documentation has moved to this GitHub repo: ⚠️
+
+https://github.com/fluentlabs-xyz/docs-docusaurus
+
+⚠️ Open new pull requests for documentation updates instead. ⚠️
 
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