Adding RSS Feed to our blog (published using JupyterBooks)

[rlundeen2]

It would be great to have an RSS feed that retrieves content from out blog https://azure.github.io/PyRIT/blog/README.html

I tried for an hour or two messing with _config.yaml but couldn't figure out how to do it.

[fdubut]

@rlundeen2 good to close now that #1090 has been merged 😊