updating the node page to simplify

[thisisjofrank]

Updating as per @littledivy's feedback in #2684

• Added: Quick start

• Added: First-class package.json support

• Reordered: Node.js global objects earlier

• Simplified: CommonJS intro and troubleshooting

• Added: .cjs run example (deno run -A main.cjs)

• Added: node_modules mode decision guide

• Removed: npx analogy snippet

• Renamed: Deno 1.X-specific node_modules subsection

• Compressed: Migrating and Optional improvements

• Content refocused on tasks and outcomes

• Duplicates removed and legacy bits trimmed

• Headings and structure tightened

@littledivy please feel free to edit/remove details as you see fit!

[littledivy]

LGTM! A quick start section is nice

[bartlomieju]

I honestly feel we should limit number of examples using npm: specifiers in the docs website and should prefer deno install npm:chalk and then import chalk from "chalk"; so it's as familiar as possible to people coming from Node

[bartlomieju]

Suggested change

	// CommonJS works out of the box
	module.exports = { ok: true };
	console.log("CJS runs in Deno");
	const chalk = require("chalk");
	console.log(chalk.green("Hello from npm in Deno"));

[bartlomieju]

Suggested change

	### Run a .cjs file
	### Execute CommonJS

[bartlomieju]

Suggested change

	```js title="main.cjs"
	Use `.cjs` extension to inform Deno that module is using CommonJS system.
	```js title="main.cjs"

[bartlomieju]

Suggested change

	```js title="process.mjs"
	import process from "node:process";
	console.log(process.platform);
	```
	```sh
	deno run process.mjs
	```js title="process.js"
	import path from "node:path";
	console.log(path.join("./foo", "../bar"));

deno run process.js

(.mjs is not important and process is widely available as a global)

[bartlomieju]

Suggested change

	using `nodeModulesDir` in `deno.json` or the `--node-modules-dir` flag (see the
	node_modules section below).
	using `nodeModulesDir` in `deno.json`.