[DEPRECATION FYI] - Polyglot Notebooks extension in VS Code

Polyglot Notebooks extension in VS Code is being deprecated and no new features will be added to .NET Interactive as a kernel for Jupyter Notebooks. This repo was flagged as one that had sample notebooks that recommended the extension and the .NET Interactive kernel.

The announcement with more details and guidance can be found here: https://aka.ms/pgnb-dep

This doc was found (https://github.com/Azure-Samples/openai/tree/main/Basic_Samples/Datastores/dotnet/csharp) but please audit and make sure no others were left behind!