docs: Revert "docs: Add Google Tag Manager (#8275)"

This reverts commit 258046d.

Author: igorlukanin

docs/theme.config.tsx

@@ -15,23 +15,6 @@ const repo = "https://github.com/cube-js/cube";
 const branch = "master";
 const path = "/docs/";
 
-const GoogleTagManager = () => (
-  <>
-    <script dangerouslySetInnerHTML={{ __html: `
-      (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-52W7VM2');
-    `}} ></script>
-  </>
-)
-
 const config: DocsThemeConfig = {
   logo: LogoWithVersion,
   logoLink: undefined,
@@ -46,7 +29,6 @@ const config: DocsThemeConfig = {
   head: (
     <>
       <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-      <GoogleTagManager />
     </>
   ),
   useNextSeoProps: () => {