Archived documentation messaging (#744)

Consolidates documentation into the main repository.

This change improves maintainability, keeps documentation closer to the
codebase, streamlines the development workflow, and provides a single
source of truth for all Nitric resources.

Instructs users to update bookmarks and references to the new
documentation location.

Author: davemooreuws

README.md

@@ -1,5 +1,31 @@
+# 🚨 ARCHIVED: Nitric Documentation
+
 <p align="center"><a href="https://nitric.io" target="_blank"><img src="https://raw.githubusercontent.com/nitrictech/nitric/main/docs/assets/nitric-logo.svg" height="120"></a></p>
 
+> **This repository has been archived. The documentation has been moved to the main Nitric repository.**
+
+## Documentation Location
+
+The official Nitric documentation is now maintained in the main Nitric repository:
+
+- [Nitric Documentation](https://github.com/nitrictech/nitric/tree/main/docs)
+- [Live Documentation Site](https://nitric.io/docs)
+
+## Why This Change?
+
+We've consolidated our documentation into the main Nitric repository to:
+
+- Improve maintainability
+- Keep documentation closer to the codebase
+- Streamline our development workflow
+- Provide a single source of truth for all Nitric resources
+
+Please update any bookmarks or references to point to the new documentation location.
+
+---
+
+_This repository is kept for historical reference only and is no longer actively maintained._
+
 ## The official Nitric documentation repo
 
 Documentation for the [Nitric framework](https://github.com/nitrictech/nitric).