Archive demo repository and update description (#312)

Updated README to reflect the archiving of the demo repository and link to the new bundle.

Author: petercrocker

README.md

@@ -10,12 +10,8 @@
 - **Version Control**: Natively integrated into the graph database which opens up some new capabilities like branching, diffing, and merging data directly in the database.
 - **Unified Storage**: By combining a graph database and git, Infrahub stores data and code needed to manage the infrastructure.
 
-## Infrahub - Demo repository for a DC
+## Infrahub - Demo repository for a DC (ARCHIVE)
 
 ![infrahub-demo-dc-fabric drawing](docs/docs/infrahub-demo-dc-fabric.excalidraw.svg)
 
-This repository is demoing the key Infrahub features for an example data center with VxLAN/EVPN and firewalls. It demonstrates the capabilities to use Infrahub with Arista AVD. Infrahub generates configurations that AVD deploys.
-
-## Running the demo
-
-Documentation for loading and using this demo is available [here](https://docs.infrahub.app/demo/demo-dc-fabric/)
+This archived repository is an older demo showing an example data center with VxLAN/EVPN and firewalls. It has been superceded by the [infrahub-bundle-dc](https://github.com/opsmill/infrahub-bundle-dc) bundle.