docs: Add link to Changelog

Author: igorlukanin

docs/pages/_meta.js

@@ -31,4 +31,11 @@ module.exports = {
     type: "page",
     title: "Documentation",
   },
+
+  changelog: {
+    type: "page",
+    title: "Changelog",
+    href: "https://cube.dev/blog/category/changelog",
+    newWindow: true,
+  },
 };