google analytics script

also:
- meta name="google-site-verification"
- iframe resize function

not sure if they are necessary though

Author: azhebel

docs/StardustDocs/cfg/buildprofiles.xml

@@ -3,6 +3,7 @@
 <buildprofiles xsi:noNamespaceSchemaLocation="https://resources.jetbrains.com/writerside/1.0/build-profiles.xsd"
                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
     <variables>
+        <include-in-head>dpk-gtm-analytics.html</include-in-head>
         <header-logo>kotlin-logo.svg</header-logo>
         <web-root>https://kotlin.github.io/dataframe/</web-root>
         <download-page/>
@@ -13,7 +14,6 @@
         <algolia-api-key>bce9ba6ce7419efe813d671244d3bf6a</algolia-api-key>
         <search-scopes-provider>https://www.jetbrains.com/search/json/</search-scopes-provider>
         <generate-sitemap-url-prefix>https://kotlin.github.io/dataframe/</generate-sitemap-url-prefix>
-        <analytics-head-script-file>resize-iframes.js</analytics-head-script-file>
         <enable-browser-edits>true</enable-browser-edits>
         <browser-edits-url>https://github.com/Kotlin/dataframe/edit/master/docs/StardustDocs/</browser-edits-url>
     </variables>

docs/StardustDocs/cfg/resize-iframes.js renamed to docs/StardustDocs/cfg/dpk-gtm-analytics.html

@@ -1,15 +1,18 @@
 <meta name="google-site-verification" content="Lffz_ab-_S5cmA07ZXVbucHVklaRsnk8gEt8frHKjMk"/>
-<!-- Google Analytics -->
-<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', 'UA-47631155-3', 'auto');
-    ga('send', 'pageview');
+<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' ? '&amp;l=' + l : '';
+        j.async = true;
+        j.src = '//www.googletagmanager.com/gtm.js?id=' + i + dl;
+        f.parentNode.insertBefore(j, f);
+    })(window, document, 'script', 'dataLayer', 'GTM-5P98');
 </script>
-<!-- End Google Analytics -->
+
+<script src="https://resources.jetbrains.com/storage/help-app/v6/analytics.js"></script>
+
 <script>
     window.onload = function() {
         function updateIframeThemes(theme) {