_includes/head.html

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="ROBOTS" content="ALL" />
    <meta name="MSSmartTagsPreventParsing" content="true" />
    <meta name="Copyright" content="" />
    <meta name="keywords" content="open-source, search, opensearch" />
    <meta name="description" content="{{ page.description}}" />

    {{ page.link_rel_tags }}
    <!-- Favicons -->
    <link rel="apple-touch-icon" href="{{'assets/img/icon-touch.png' | relative_url }}">
    <link rel="icon" sizes="192x192" href="{{'assets/img/icon-touch.png' | relative_url }}">
    <link rel="shortcut icon" href="{{'assets/img/favicon.ico' | relative_url }}">
    <meta name="msapplication-TileColor" content="#113228">
    <meta name="msapplication-TileImage" content="{{'img/icon-tile.png' | relative_url }}">
    
    {% assign pagetitle = page.title | | strip_newlines %}
    <title>{% if pagetitle != "" %} {{ page.title | append: " &middot;" }} {% endif %} OpenSearch</title>

    <link rel="stylesheet" href="{{'assets/css/output.css' | relative_url }}" >
    <script src="{{ 'assets/js/lib/webfontloader/webfontloader.js' | relative_url }}"></script>
    <script>
    WebFont.load({
      custom: {
        families: ['FontAwesome', 'Fira+Mono'],
      },
      google: {
        families: ['Roboto:400italic,700italic,300,700,400:latin'
        ]
      },
      classes: false,
      events: false,
      timeout: 1000
    });
    </script>
    <script src="{{ 'assets/js/lib/modernizr.js' | relative_url }}"></script>
    <!-- Global site tag (gtag.js) - Google Analytics -->
    <script async src="https://www.googletagmanager.com/gtag/js?id=G-BQV14XK08F"></script>
    <script>
      window.dataLayer = window.dataLayer || [];
      function gtag(){dataLayer.push(arguments);}
      gtag('js', new Date());
      gtag('config', 'G-BQV14XK08F');
    </script>
    {{ page.head_extra }}
  </head>