docs: add playground

docs/.vitepress/config.ts

@@ -32,6 +32,10 @@ export default defineConfig({
     logo: '/favicon.svg',
 
     nav: [
+      {
+        text: 'Playground',
+        link: '/playground',
+      },
       {
         text: 'Guide',
         activeMatch: '^/guide/',
@@ -117,6 +121,7 @@ function sidebarPrimary(): DefaultTheme.SidebarItem[] {
     {
       text: 'Tooling',
       items: [
+        { text: 'Playground', link: '/playground' },
         { text: 'CLI Reference', link: '/cli/' },
         { text: 'Tools & Playgrounds', link: '/ecosystem/tools-and-playgrounds' },
       ],