Update pandas topic

[valerievossen]

The following topic I created a few months ago: pandas basics for data manipulation topic: https://tilburgsciencehub.com/topics/manage-manipulate/manipulate-clean/numerical/pandas/

@lachlandeer gave me his guide to update this topic and add relevant stuff: https://pp4rs.github.io/pp4rs-python/notebooks/pandas/00-motivating_pandas.html

I am now putting it here so it doesn't get lost. I will do assign myself when I have more time after finishing other things, or someone else that is interested, feel free to assign yourself!