Revert "Merge pull request PrestaShop#6 from PrestaShop/add-ga"

Google analytics is already handled by internal template (facepalm)

This reverts commit 3003600, reversing
changes made to 3dc403d.

layouts/partials/head.html

@@ -13,19 +13,6 @@
 <meta name="author" content="{{ . }}">{{ end }}
 {{ hugo.Generator }}
 
-{{ with site.Params.googleAnalytics }}
-    {{ if . }}
-      <!-- Google tag (gtag.js) -->
-      <script async src="https://www.googletagmanager.com/gtag/js?id={{ . }}"></script>
-      <script>
-        window.dataLayer = window.dataLayer || [];
-        function gtag(){dataLayer.push(arguments);}
-        gtag('js', new Date());
-        gtag('config', '{{ . }}');
-      </script>
-    {{ end }}
-{{ end }}
-
 <!--Favicon-->
 <link rel="shortcut icon" href="{{ site.Params.favicon | absURL }}" type="image/x-icon">
 <link rel="icon" href="{{ site.Params.favicon | absURL }}" type="image/x-icon">