Ionic guide update (#22209)

* updated angular guide to focus on angular 2+

* updated intro to ionic guide

guide/english/ionic/index.md

@@ -11,40 +11,27 @@ Hybrid apps have many benefits over pure native apps, specifically in terms of p
 
 Those familiar with web development will find the structure of an Ionic app straightforward. At its core, it’s just a web page running in an native app shell! That means we can use any kind of HTML, CSS, and Javascript we want. 
 
-The bulk of an Ionic app will be written in HTML, Javascript, and CSS. Ionic also uses AngularJS for a lot of the core functionality of the framework.
+As of Ionic 2, the framwork uses Angular (previously using AngularJS), please see seperate freeCodeCamp guides on Angular.
 
 ### Before we can start playing with Ionic. Let’s prepare our system first:
 
-```
-  nodeJS and npm
-  Ionic 2
-  Cordova
-  Android Environment (or iOS if you’re working on a MacOS)
-```
-  
-### First thing first, we need to have Node.js and npm.
+The easiest way to use Ionic is via its [CLI](https://ionicframework.com/docs/cli/). Those familiar with [Angular's CLI](https://cli.angular.io/) should see some resemblances.
 
-```
-  sudo apt-get update
-  sudo apt-get install nodejs
-```
-  
-### Node.js package manager (npm)
+Prerequisites:
 
-```  
-  sudo apt-get install npm
-```
-  
-### Ionic 2 and cordova
+- nodejs / npm 
+- xcode (if wanting to build iOS apps)
+- Android SDK (if building Android apps)
 
-```
-  sudo npm install -g ionic cordova
-```
-  
-### Now sit back and relax, give it some time to finish, it can take several minutes depending on your internet connection.
-Once that’s done, Let’s start off by generating a new project based on the “blank” template
+Install ionic CLI:
 
+```shell
+  npm i -g ionic cordova    
 ```
+ 
+Create a new project and run in the browser:
+
+```shell
   ionic start MyFirstApp blank
   cd MyFirstApp 
   ionic serve