Add navigation links to layout config

Introduces a 'links' array to the baseOptions in layout.config.tsx, providing navigation items for Guides, Concepts, Specs, and Reference sections.

Author: hotlong

apps/docs/app/layout.config.tsx

@@ -16,5 +16,27 @@ export const baseOptions: BaseLayoutProps = {
     ),
     transparentMode: 'top',
   },
+  links: [
+    {
+      text: 'Guides',
+      url: '/docs/guides/getting-started',
+      active: 'nested-url',
+    },
+    {
+      text: 'Concepts',
+      url: '/docs/concepts/manifesto',
+      active: 'nested-url',
+    },
+    {
+      text: 'Specs',
+      url: '/docs/specifications/data/architecture',
+      active: 'nested-url',
+    },
+    {
+      text: 'Reference',
+      url: '/docs/references/data/core/Object',
+      active: 'nested-url',
+    },
+  ],
   githubUrl: 'https://github.com/objectstack-ai/spec',
 };