Sample code snippet and introduction for the fslab website

Hi there, awesome work on this library!

As I will be talking about FsLab next week at .NET Conf: Focus on F#, there might be some new traffic on that page, therefore I extended the introduction parts (click on read more) of the libraries I maintain with some more introductory text and simple code snippets.

The [packages page](https://fslab.org/packages.html) contains flips as well as a part of the fslab toolbox. If you would like to add some text/snippets, the markdown file that renders the flips card is located [here](https://github.com/fslaborg/fslaborg.github.io/blob/main/src/content/datascience-packages/flips.md) (it has just been the project summary for the last months). [Here](https://github.com/fslaborg/fslaborg.github.io/blob/main/src/content/datascience-packages/plotly.net.md) is the same for Plotly.NET as reference.

Cheers!