Updated scripts for correctly using gtag.

[sr-dash]

Implementation of Google tag ID to correctly getting tracked requires further modification in addition to the one line script in the _includes/scripts.liquid file as

<script async src="https://www.googletagmanager.com/gtag/js?id={{ site.google_analytics }}"></script>
  <script>
    window.dataLayer = window.dataLayer || [];
    function gtag() {
      dataLayer.push(arguments);
    }
    gtag('js', new Date());

    gtag('config', '{{ site.google_analytics }}');
  </script>

I have made the changes and tested it out on my personal webpage to ensure the tracking in analytics dashboard.

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