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Most of the samples don't show anything for me... Maybe a description of what it's supposed to be, at most. No code or files.

Same here. I wonder what happened to cause the code not to display. But you can find the source code samples on github:

This section of the docs has some examples: https://neon-lang.dev/docs/overview.html

Seems like a work in progress, other sections of the docs (like the tutorial) are blank as well.