Ctrl+F and try skipping to ";;;; The Basic Macros" section on that quick start page. Is that about the right level?
For many of the "popular" languages, a simple cheat sheet showing the equivalent control structures in a common language might be enough for a typical programmer to get a handle on it quickly. But Lisp is not an Algol-family language. It's different enough that such a document would fail to convey what makes it interesting. There's an inferential gap that must be bridged first, and it's difficult to do that quickly; a programmer mistakenly [expecting a short inferential distance][1] may not have the patience to "get it".
[1]: https://www.lesswrong.com/posts/HLqWn5LASfhhArZ7w/expecting-...
1) Simple, one way to do everything. for loops, code formatting, and project setup.
2) Good concurrency (go routines)
3) No exceptions, readable code and error handling.
This article is titled "Why Hy." It should sell me on the language with a philosophy supported by examples, not instruct me on how to write a floating point number (unless the language has a interesting take on writing floating point numbers!)