Pls add google-tag-manager

_includes/google-tag-manager.html

{% if site.google-tag-manager %}
    <!-- Google Tag Manager -->
    <noscript><iframe src="//www.googletagmanager.com/ns.html?id=GTM-5ZQ6V7"
    height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
    <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
    new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
    j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
    '//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
    })(window,document,'script','dataLayer','{{ site.google-tag-manager }}');</script>
    <!-- End Google Tag Manager -->
{% endif %}

_layouts/default.html

<!DOCTYPE html>
<html>
  <head>
    <title>{% if page.title %}{{ page.title }} – {% endif %}{{ site.name }} – {{ site.description }}</title>

    {% include meta.html %}

    <!--[if lt IE 9]>
      <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
    <![endif]-->

    <link rel="stylesheet" type="text/css" href="{{ site.baseurl }}/style.css" />
    <link rel="alternate" type="application/rss+xml" title="{{ site.name }} - {{ site.description }}" href="{{ site.baseurl }}/feed.xml" />

    <!-- Created with Jekyll Now - http://github.com/barryclark/jekyll-now -->
  </head>

  <body>
    {% include google-tag-manager.html %}
    <div class="wrapper-masthead">
      <div class="container">
        <header class="masthead clearfix">
          <a href="{{ site.baseurl }}/" class="site-avatar"><img src="{{ site.avatar }}" /></a>

          <div class="site-info">
            <h1 class="site-name"><a href="{{ site.baseurl }}/">{{ site.name }}</a></h1>
            <p class="site-description">{{ site.description }}</p>
          </div>

          <nav>
            <a href="{{ site.baseurl }}/">Blog</a>
            <a href="{{ site.baseurl }}/about">About</a>
          </nav>
        </header>
      </div>
    </div>

    <div id="main" role="main" class="container">
      {{ content }}
    </div>

    <div class="wrapper-footer">
      <div class="container">
        <footer class="footer">
          {% include svg-icons.html %}
        </footer>
      </div>
    </div>

    {% include analytics.html %}
  </body>
</html>

_config.yml

#
# This file contains configuration flags to customize your site
#

# Name of your site (displayed in the header)
name: Name Site

# Short bio or description (displayed in the header)
description: Site description

# URL of your avatar or profile pic (you could use your GitHub profile pic)
avatar: https://raw.githubusercontent.com/barryclark/jekyll-now/master/images/jekyll-logo.png

#
# Flags below are optional
#

# Includes an icon in the footer for each username you enter
footer-links:
  dribbble:
  email:
  facebook:
  flickr:
  github:
  instagram:
  linkedin:
  pinterest:
  rss: # just type anything here for a working RSS icon
  twitter:
  stackoverflow: # your stackoverflow profile, e.g. "users/50476/bart-kiers"
  youtube: # channel/<your_long_string> or user/<user-name>
  googleplus: # yourname

# Enter your Disqus shortname (not your username) to enable commenting on posts
# You can find your shortname on the Settings page of your Disqus account
disqus:

# Enter your Google Analytics web tracking code (e.g. UA-2110908-2) to activate tracking
google_analytics:

# Or enter your Google Tag Manager web tracking code https://tagmanager.google.com (e.g. GTM-5RRMLA) to activate tracking
google-tag-manager:

# Your website URL (e.g. http://barryclark.github.io or http://www.barryclark.co)
# Used for Sitemap.xml and your RSS feed
url:

# If you're hosting your site at a Project repository on GitHub pages
# (http://yourusername.github.io/repository-name)
# and NOT your User repository (http://yourusername.github.io)
# then add in the baseurl here, like this: "/repository-name"
baseurl: ""

#
# !! You don't need to change any of the configuration flags below !!
#

permalink: /:title/

# The release of Jekyll Now that you're using
version: v1.2.0

# Jekyll 3 now only supports Kramdown for Markdown
kramdown:
  # Use GitHub flavored markdown, including triple backtick fenced code blocks
  input: GFM
  # Jekyll 3 and GitHub Pages now only support rouge for syntax highlighting
  syntax_highlighter: rouge
  syntax_highlighter_opts:
    # Use existing pygments syntax highlighting css
    css_class: 'highlight'

# Set the Sass partials directory, as we're using @imports
sass:
  style: :expanded # You might prefer to minify using :compressed

# Use the following plug-ins
gems:
  - jekyll-sitemap # Create a sitemap using the official Jekyll sitemap gem
  - jekyll-feed # Create an Atom feed using the official Jekyll feed gem

# Exclude these files from your production _site
exclude:
  - Gemfile
  - Gemfile.lock
  - LICENSE
  - README.md
  - CNAME

barryclark / jekyll-now

Pls add google-tag-manager #510