update angular font awesome code example

Example 1: font awesome angular

//install in your project directory
npm install --save @fortawesome/fontawesome-free

// in angular.json add in the 'build' section the following lines in 'styles' and 'scripts'
"styles": [
           "node_modules/@fortawesome/fontawesome-free/css/all.css"
        ]

"scripts": [
          "node_modules/@fortawesome/fontawesome-free/js/all.js"
        ]

//from now on, you can use fontawesome icons through the <i>
    <i class='fab fa-facebook'></i>

Example 2: how to use the downloaded fontawsoem icons in angula

"apps": [
    {
      "root": "src",
      "outDir": "dist",
      ....
      "styles": [
          "styles.css",
          "../node_modules/bootstrap/dist/css/bootstrap.css",
          "../node_modules/font-awesome/css/font-awesome.css" // -here webpack will automatically build a link css element out of this!?
      ],
      ...
  }
  ]
],

Example 3: how to get fas icons in angualr

import { library } from '@fortawesome/fontawesome-svg-core';
import { fas } from '@fortawesome/free-solid-svg-icons';
import { far } from '@fortawesome/free-regular-svg-icons';
library.add(fas, far);