Update README and CONTRIBUTING

Author: cknitt

CONTRIBUTING.md

@@ -36,9 +36,6 @@ opam install ocaml-lsp-server
 
 # Any recent OCaml version works as a development compiler
 opam switch create 4.14.0 # can also create local switch with opam switch create . 4.14.0
-
-# We use NodeJS to run our test suites and other utilities.
-npm install
 ```
 
 ## Initialize submodules
@@ -50,6 +47,10 @@ git submodule init
 git submodule update
 ```
 
+## npm install
+
+Run `npm install`. This will build the ninja binary and run an initial `./scripts/ninja.js config` and `./scripts/ninja.js build` (see below).
+
 ## Configure and Build the Compiler (`ninja` workflow)
 
 > Note: These instructions allow you to do full builds of the project. In case you only want to build the project for development purposes, you can use the `dune` workflow, but you will still need to run the first step: `./scripts/ninja.js config`.

README.md

@@ -104,7 +104,7 @@ ReScript is licensed under LGPL version 3, with relaxed rules about creating and
 `vendor/ocaml.tar.gz` contains the official [OCaml](https://ocaml.org) compiler (version 4.14.0).
 Refer to its copyright and license notices for information about its licensing.
 
-The `ninja` submodule contains the vendored [ninja](https://github.com/ninja-build/ninja) build system.
+The `ninja` subdirectory contains the vendored [ninja](https://github.com/ninja-build/ninja) build system.
 Refer to its copyright and license notices for information about its licensing.
 
 ## 🏅 Acknowledgments