docs: add Clarity tracking script to VitePress config

Author: huangdijia

.vitepress/config.mts

@@ -25,6 +25,19 @@ export default defineConfig({
         s.parentNode.insertBefore(hm, s);
       })();
       `
+    ],
+    [
+      'script',
+      {},
+      `
+      <script type="text/javascript">
+    (function(c,l,a,r,i,t,y){
+        c[a]=c[a]||function(){(c[a].q=c[a].q||[]).push(arguments)};
+        t=l.createElement(r);t.async=1;t.src="https://www.clarity.ms/tag/"+i;
+        y=l.getElementsByTagName(r)[0];y.parentNode.insertBefore(t,y);
+    })(window, document, "clarity", "script", "pgqv4ftymf");
+</script>
+      `
     ]
   ],
   locales:{