Show Nim: New Pixie 5.0 release with significant performance improvements

[markus_gritsch]

Pixie is great. I played around with it using pixie-python to create some 
[Truchet tiles](https://en.wikipedia.org/wiki/Truchet_tiles). .. image:: 
<https://i.postimg.cc/5thBfC9w/Truchet-pixie.png> .. image:: 
<https://postimg.cc/dZGK2ZhN/f9259641>