You can use Calibre to convert almost any text file into ebook format. In this case, copy the text from the web site and paste it into notepad. Save the file and add it to your library in Calibre. Convert it with Calibre to the correct format for your ebook and then add it to your device.
Calibre is free -
In a review, I think I read this before. I’m not sure the is anything new here.