Docs: add google analytics, baidu and clarity (#1629)

Signed-off-by: Carson Yang <yangchuansheng33@gmail.com>

docSite/layouts/partials/docs/analytics/google.html

@@ -0,0 +1,26 @@
+<!-- Google tag (gtag.js) -->
+<script defer>
+  function loadAnalyticsScript() {
+    var script = document.createElement('script');
+    script.async = true;
+    script.src = 'https://gaxy.fastgpt.in/gtag/js?id=G-KGYF44Y7TT';
+    document.head.appendChild(script);
+
+    window.dataLayer = window.dataLayer || [];
+    function gtag() {
+      dataLayer.push(arguments);
+    }
+    gtag('js', new Date());
+    gtag('config', 'G-KGYF44Y7TT');
+
+    window.removeEventListener('scroll', onScrollLoadAnalytics);
+  }
+
+  function onScrollLoadAnalytics() {
+    if (window.scrollY > 100) {
+      loadAnalyticsScript();
+    }
+  }
+
+  window.addEventListener('scroll', onScrollLoadAnalytics);
+</script>