Re: Tree-sitter introduction documentation

[Gregory Heytings]

> The cli doesn't have any dependencies, so only node itself is required. 
> One should only need to run
>
> npm install tree-sitter-cli

Doing that is easier (it is not necessary to install the Rust toolchain), 
but it downloads and installs a binary executable of tree-sitter, e.g. 
from

https://github.com/tree-sitter/tree-sitter/releases/download/v0.20.7/tree-sitter-linux-x64.gz