This is the correct way to generate all pygments CSS files.
Before running generate.py remember to install all requirements.
This can done with pip install -r requirements.txt (preferably in a virtualenv, or use pipx.
After this you can run ./generate.py.
Remember to run inside this folder.
Because it uses relative path to place inside static/pygments folder.
After that, go back to the reflex path and run gulp pygments to generate all min.css files.