Remove notes about npm

notes/js/js.md

@@ -30,7 +30,6 @@
   - [Running programs in Node.js](#running-the-interpreter)
   - [Modules](#modules): Node.js builtin modules, `require`, and `module.exports`
   - [Example](#nodejs-example)
-  - [npm](#installing-npm-packages): using open-source libraries with npm
   - [Documentation](#nodejs-documentation)
 ---
 
@@ -907,7 +906,6 @@ list234.toArray() // [2, 3, 4]
 
 Most of the functions included in Node.js need to be imported from the corresponding library, e.g. `fs` for file system operations, `http` for making HTTP servers and requests, and `zlib` for compressing and decompressing files.
 See the example below for using one of these modules.
-[npm packages](#installing-npm-packages) are also imported the same way.
 
 ### Node.js example
 
@@ -940,43 +938,6 @@ fs.readFile(source, (err, data) => {
 })
 ```
 
-### Installing npm packages
-
-If you haven't used a package manager before, the idea is simple: they allow people to publish open source code libraries for other projects to use.
-Node.js's package manager is called [npm](npmjs.com) and it hosts more published packages than any other package manager.
-If you want to use npm with a new project, run `npm init` to create a `package.json` file: this file stores information about the project, including which packages it depends on.
-However, we will provide you all the `package.json` files you need.
-To install the "dependencies" specified in `package.json`, run `npm install`.
-
-For example, the [`colors`](https://www.npmjs.com/package/colors) package on npm allows you to print colored text in the terminal.
-You could use the following `package.json` for a new project `colors-test` that depends on version 1.4.0 or newer of `colors`:
-```json
-{
-  "name": "colors-test",
-  "version": "0.0.1",
-  "dependencies": {
-    "colors": "^1.4.0"
-  }
-}
-```
-Running `npm install` installs `colors` and prints:
-```
-added 1 package from 2 contributors and audited 1 package in 0.323s
-found 0 vulnerabilities
-```
-Now we can `require('colors')` in our program:
-```js
-const colors = require('colors')
-console.log(
-  colors.red('r') +
-  colors.yellow('y') +
-  colors.green('g') +
-  colors.blue('b')
-)
-```
-Running this program prints:
-![Colors test](colors.png)
-
 ### Node.js documentation
 
 Node.js also has very detailed documentation of its standard library at [nodejs.org](https://nodejs.org/api/).