This reverts PR #2962. The inline script here is exactly the same as the
`/assets/js/google-analytics-setup.js` sourced on the following line, so
Google Analytics is being triggered twice.
It seems that #2962 originally added this because liquid templating of
the setup script didn't work (#3095). However, this was then properly
fixed in #3117.
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.
