_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">
  {%- seo -%}
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@latest/css/all.min.css">
  <link rel="stylesheet" href="{{ '/assets/css/style.css' | relative_url }}">
  {%- feed_meta -%}
  {%- if jekyll.environment == 'production' and site.google_analytics -%}
    {%- include google-analytics.html -%}
  {%- endif -%}

  {%- include custom-head.html -%}
  
</head>