Documentation unclear on how to use

As an unexperienced C++ programmer, the instructions on how to get Catch are confusing and seemingly scattered throughout several files.
_/docs/why-catch.md_ tells me to just "Just download two files, add them into your project and you're away." which makes me think I can just get the .cpp and .hpp from the releases and drop them in my project.
However, _/docs/tutorial.md_ sends me to _/docs/cmake-integration.md_ which tells me to install it via a package manager or clone the repository.

So which is it? And should this information not be grouped together in a more general installation file?