Update 01-quickstart.mdx ts-node to tsx

[dannybunschoten]

The current documentation contains a call to ts-node. However ts-node does not play nicely with ES-modules, and can be a pain to setup. As can be seen in this stackoverflow post. Furthermore, prisma is a platinum sponsor of tsx.

I changed the call from ts-node to tsx to make it easier for beginners to follow the getting started without needing to setup a lot.

This is my first pull request, so please let me know if there are any changes to be made.