Fix external dependencies to use NPM

[James-Oswald]

Fork awesome and theme change library both are imported via CDN links. They should be added as node dependencies so we can get updates for them.

    <!--Fork Awesome Icons-->
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/fork-awesome@1.2.0/css/fork-awesome.min.css" integrity="sha256-XoaMnoYC5TH6/+ihMEnospgm0J1PM/nioxbOUdnM8HY=" crossorigin="anonymous">
    <!--Theme Change Library-->
    <script src="https://cdn.jsdelivr.net/npm/theme-change@2.0.2/index.js"></script>

• https://www.npmjs.com/package/theme-change
• https://www.npmjs.com/package/fork-awesome
  (We may need to migrate off fork awesome if we can't integrate this properly)