Re: Tree-sitter introduction documentation

[Gregory Heytings]

> Indeed, IIUC, Tree-sitter uses Javascript as a preprocessor, so the 
> source grammar is a Javascript program which returns a grammar 
> represented as a JS object (could probably be easily mapped to JSON). 
> which is then turned into a `.c` file by a Rust program.

The whole process is:

{grammar.js} -> [Node.js] -> {grammar.json} -> [tree-sitter] -> {parser.c} -> [cc 
or c++] -> {library file}
{scanner.c or scanner.cc} 
---------------------------------------------------------^

where {} are files and [] are programs.