Refactor move docs (#8108)

* feat: [skip] generate readme script

* docs: [skip ci] update READMEs

* docs: [skip ci] fix code block type

* chore: [skip ci] move generator script

packages/babel-plugin-syntax-async-generators/README.md

@@ -1,57 +1,19 @@
 # @babel/plugin-syntax-async-generators
 
-> Allow parsing of async generator functions.
+> Allow parsing of async generator functions
 
-## Example
+See our website [@babel/plugin-syntax-async-generators](https://new.babeljs.io/docs/en/next/babel-plugin-syntax-async-generators.html) for more information.
 
-**Syntax**
+## Install
 
-```javascript
-async function* agf() {
-  await 1;
-}
-```
-
-```js
-async function f() {
-  for await (let x of y) {
-    g(x);
-  }
-}
-```
-
-## Installation
+Using npm:
 
 ```sh
-npm install --save-dev @babel/plugin-syntax-async-generators
+npm install --save @babel/plugin-syntax-async-generators
 ```
 
-## Usage
-
-### Via `.babelrc` (Recommended)
-
-**.babelrc**
-
-```json
-{
-  "plugins": ["@babel/plugin-syntax-async-generators"]
-}
-```
-
-### Via CLI
+or using yarn:
 
 ```sh
-babel --plugins @babel/plugin-syntax-async-generators script.js
+yarn add --save @babel/plugin-syntax-async-generators
 ```
-
-### Via Node API
-
-```javascript
-require("@babel/core").transform("code", {
-  plugins: ["@babel/plugin-syntax-async-generators"]
-});
-```
-
-## References
-
-* [Proposal: Asynchronous iteration for ECMAScript](https://github.com/tc39/proposal-async-iteration)