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I would suggest not to follow that tutorial. For some reason the tutorial clones NodeBB under /var/www which is not required.
Also you will end up using the master branch of NodeBB which is a development version and is likely to have bugs.
+1 for a direct link.
I guess the most direct at the moment is via github (pricing -> github -> Documentation & Installation Instructions) o_O .
docs.nodebb.org <-- now it's in mine too 😛