feat(config): add Changelog tab to navigation

apps/docs/blume.config.ts

@@ -222,10 +222,12 @@ export default defineConfig({
   },
   navigation: {
     repo: "https://github.com/prdlk/leetcode",
-    actions: [{ href: "/changelog", label: "Changelog" }],
     sidebar: {
       display: "flat", // "flat" | "group" | "page"
     },
-    tabs: [{ label: "Guides", path: "/guides" }],
+    tabs: [
+      { label: "Guides", path: "/guides" },
+      { label: "Changelog", path: "/changelog" },
+    ],
   },
 });