_includes/head.html

<head>
    {%- if site.gtm -%}
        {%- include gtm-head_{{jekyll.environment}}.html -%}
    {%- elsif jekyll.environment == 'production' and site.google_analytics -%}
        {%- include google-analytics.html -%}
    {%- endif -%}
    {%- include favicon.html %}
    <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="{{ "/assets/main.css" | relative_url }}">
    <link rel="stylesheet" href="{{ "/assets/css/aside.css" | relative_url }}">
    <link rel="stylesheet" href="{{ "/assets/css/external-embed.css" | relative_url }}">
    {%- if jekyll.environment == 'development' -%}
        <script src="http://localhost:35729/livereload.js"></script>
    {%- endif -%}
    {%- feed_meta -%}
    <!-- Custom additional head -->
    {%- include custom.html %}
    <!-- End Custom head -->
</head>