_includes/head.html

<head>
  <link href="https://gmpg.org/xfn/11" rel="profile" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta http-equiv="content-type" content="text/html; charset=utf-8" />

  <!-- Enable responsiveness on mobile devices-->
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1" />

  <title>
    {% if page.title == "Home" %}
    {{ site.title }}{% if site.tagline %} &middot; {{ site.tagline }}{% endif %}
    {% else %}
    {{ page.title }} &middot; {{ site.title }}
    {% endif %}
  </title>
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
  {% if site.environment == production %}
  {% include google-analytics.html %}
    integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
    {% include font-includes.html %}
    {% else %}
    <meta name="googlebot" content="noindex">
    {% endif %}
    
    <!-- CSS -->
  <link rel="stylesheet" href="{{ "/assets/css/main.css" | relative_url }}" />
  <!-- Icons -->
  {% include favicons.html %}

  <!-- RSS -->
  <link rel="alternate" type="application/rss+xml" title="RSS"
    href="{{ site.feed.path | default: 'feed.xml' | relative_url }}" />

  {% include custom-head.html %}

</head>