Blog post for Renku API

We have a blog post in discourse for the Renku Python API: https://renku.discourse.group/t/renku-python-api/340.

We should update this post to work with the API modifications (e.g. names for Input/Output). In addition, we should extend it with a use-case for pandas and publish it in medium.

See https://swiss-data-science.slack.com/archives/C0133UVATF1/p1686575949763119 for some context.