Add tag manager instead of Google Analytics

_config.yml

@@ -180,7 +180,7 @@ algolia:
   api_key: d2d0f33ab73e291ef8d88d8b565e754c
 
 google:
-  analytics: UA-66243208-1
+  gtm: GTM-KRCLXBB
 
 # Toggles the _plugin/html-check-hook.rb script that checks links in the generated HTML
 #

_includes/layout/header-scripts.html

@@ -10,35 +10,13 @@
 
 {% if site.environment == "public" %}
 
-<!-- Google Analytics -->
-<style>.async-hide { opacity: 0 !important} </style>
-<script>(function(a,s,y,n,c,h,i,d,e){s.className+=' '+y;h.start=1*new Date;
-h.end=i=function(){s.className=s.className.replace(RegExp(' ?'+y),'')};
-(a[n]=a[n]||[]).hide=h;setTimeout(function(){i();h.end=null},c);h.timeout=c;
-})(window,document.documentElement,'async-hide','dataLayer',4000,
-{'GTM-ML6GZCH':true});</script>
-<script>
-    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-            (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-        m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-    })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
-
-    ga('create', '{{ site.google.analytics }}', 'auto');
-    ga('require', 'GTM-ML6GZCH');
-    ga('send', 'pageview');
-</script>
-
-<!-- Hotjar Tracking Code for http://devdocs.magento.com/ -->
-<script>
-    (function(h,o,t,j,a,r){
-        h.hj=h.hj||function(){(h.hj.q=h.hj.q||[]).push(arguments)};
-        h._hjSettings={hjid:806243,hjsv:6};
-        a=o.getElementsByTagName('head')[0];
-        r=o.createElement('script');r.async=1;
-        r.src=t+h._hjSettings.hjid+j+h._hjSettings.hjsv;
-        a.appendChild(r);
-    })(window,document,'https://static.hotjar.com/c/hotjar-','.js?sv=');
-</script>
+<!-- Google Tag Manager -->
+<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=
+  'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+  })(window,document,'script','dataLayer','{{ site.google.gtm }}');</script>
+<!-- End Google Tag Manager -->
 
 <script src="//assets.adobedtm.com/98fab992275ef6366cc65f57f86b1e895a66c912/satelliteLib-f90f1129109ea4b2101512675a2769865aa7ea5b.js"></script>