move all pixel tracking into tags manager

Author: chrisspiegl

_includes/layout.pug

@@ -129,37 +129,12 @@ body
 
   //- Analytics
   if meta.build.env === 'production'
-    <!-- Google tag (gtag.js) -->
-    script(async src="https://www.googletagmanager.com/gtag/js?id=G-BFZSC5QQYT")
-    script(type="application/javascript").
-      window.dataLayer = window.dataLayer || [];
-      function gtag(){dataLayer.push(arguments);}
-      gtag('js', new Date());
-      gtag('config', 'G-BFZSC5QQYT');
-
-    <!-- Meta Pixel Code -->
-    script(type="application/javascript").
-      !function(f,b,e,v,n,t,s)
-      {if(f.fbq)return;n=f.fbq=function(){n.callMethod?
-      n.callMethod.apply(n,arguments):n.queue.push(arguments)};
-      if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';
-      n.queue=[];t=b.createElement(e);t.async=!0;
-      t.src=v;s=b.getElementsByTagName(e)[0];
-      s.parentNode.insertBefore(t,s)}(window, document,'script',
-      'https://connect.facebook.net/en_US/fbevents.js');
-      fbq('init', '907086356044933');
-      fbq('track', 'PageView');
-    noscript.
-      <img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=907086356044933&ev=PageView&noscript=1" />
-
-    <!-- TikTok Pixel Code -->
-    script(type="application/javascript").
-      !function (w, d, t) {
-        w.TiktokAnalyticsObject=t;var ttq=w[t]=w[t]||[];ttq.methods=["page","track","identify","instances","debug","on","off","once","ready","alias","group","enableCookie","disableCookie"],ttq.setAndDefer=function(t,e){t[e]=function(){t.push([e].concat(Array.prototype.slice.call(arguments,0)))}};for(var i=0;i<ttq.methods.length;i++)ttq.setAndDefer(ttq,ttq.methods[i]);ttq.instance=function(t){for(var e=ttq._i[t]||[],n=0;n<ttq.methods.length;n++)ttq.setAndDefer(e,ttq.methods[n]);return e},ttq.load=function(e,n){var i="https://analytics.tiktok.com/i18n/pixel/events.js";ttq._i=ttq._i||{},ttq._i[e]=[],ttq._i[e]._u=i,ttq._t=ttq._t||{},ttq._t[e]=+new Date,ttq._o=ttq._o||{},ttq._o[e]=n||{};n=document.createElement("script");n.type="text/javascript",n.async=!0,n.src=i+"?sdkid="+e+"&lib="+t;e=document.getElementsByTagName("script")[0];e.parentNode.insertBefore(n,e)};
-        ttq.load('CIK3FQ3C77U220R2AG4G');
-        ttq.page();
-      }(window, document, 'ttq');
-
+    <!-- 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','GTM-W4B8RJJ');
+    <!-- Google Tag Manager (noscript) -->
+    noscript
+      iframe(src="https://www.googletagmanager.com/ns.html?id=GTM-W4B8RJJ" height="0" width="0" style="display:none;visibility:hidden")
 
   <!-- MailerLite Universal -->
   script(type="application/javascript").