add font awesome to website code example

Example 1: install font awesome

npm install --save @fortawesome/fontawesome-free
$fa-font-path:        "../webfonts";
@import "~@fortawesome/fontawesome-free/scss/fontawesome.scss";
@import "~@fortawesome/fontawesome-free/scss/solid.scss";
@import "~@fortawesome/fontawesome-free/scss/brands.scss";
@import "~@fortawesome/fontawesome-free/scss/regular.scss";
please email me [email protected] if you have any issues.

Example 2: font awesome cdn

<script src="https://kit.fontawesome.com/a9545f17e8.js" crossorigin="anonymous"></script>

Example 3: fontawesome cdn

gem 'font-awesome-sass'

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