How do I download the whole Projects Docs in Github as Pdf?

How do I download the whole Projects Docs in Github as Pdf or notepad? Example clicking on this link, I would like to download whole Nunit project docs. Right now, I am only able to read by clicking on each page 1 by 1. Would like to save whole file and print out.

https://github.com/nunit/docs/wiki/TestCaseData

Using solution below, we see error as reported by many users

Unhandled rejection Error: Unknown language: "C#" –

Solution

You can do it with Github Wikito Converter:

npm install -g github-wikito-converter
git clone https://github.com/nunit/docs.wiki.git
gwtc ./docs.wiki

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