Update documentation for onboarding branch

Author: danieljurek

README.md

@@ -1,7 +1,4 @@
 # Onboarding
 
-The csvs found in `bundlepackages/` are direct copies of the ones found in the `mrefconfig` repository. They have been moved to allow for an easier automation experience for the azure-sdk team.
-
-The source of the moved files is [here](https://apidrop.visualstudio.com/binaries/_git/mrefconfig?path=%2Fbundlepackages%2Fazure)
-
-These details are used when processing intermediate yml for this repository.
+This branch is no longer used for docs CI onboarding. Use
+[`/bundlepackages/` in the `main` branch](https://github.com/Azure/azure-docs-sdk-dotnet/tree/main/bundlepackages).

bundlepackages/README.md

@@ -0,0 +1,4 @@
+# Onboarding configuration has moved
+
+Use 
+[`/bundlepackages/` in the `main` branch](https://github.com/Azure/azure-docs-sdk-dotnet/tree/main/bundlepackages)