This is irrelevant. You may be just a new comer, or not a professional developer, and still want to use yarn. A clear website seems a basic requirement to me for any project.
>A clear website seems a basic requirement to me for any project.
Well, you can't always depend on that, and in the end of the day, nothing beats actually researching and asking around.
The GNU tools have some of the worst webpages -- and yet they are some of the most useful, and commonly used, packages.
Let's take a look at GNU tar [1] and GNU social [2] webpages as examples. The first thing they tell a user is what the project is. I would say, both of them are order of magnitude better than the yarn homepage.
1. https://www.gnu.org/software/tar/ 2. https://gnu.io/social/
I don't know where you've been but anyone who is even remotely invested in the npm ecosystem probably knows what Yarn is at this point.