feat: update getting-started guide

.vitepress/config.ts

@@ -70,7 +70,7 @@ export default defineConfig({
               link: 'https://github.com/skkuding/next/blob/main/CONTRIBUTING.md'
             },
             {
-              text: 'API 문서',
+              text: 'API 문서 (Bruno)',
               link: '/dev/intro/bruno'
             }
           ]

.vitepress/theme/index.ts

@@ -1,13 +1,12 @@
+import type { Theme } from 'vitepress'
 import DefaultTheme from 'vitepress/theme'
 import './vars.css'
 
 export default {
-  // root component to wrap each page
-  ...DefaultTheme,
-
+  extends: DefaultTheme,
   enhanceApp({ app, router, siteData }) {
     // app is the Vue 3 app instance from `createApp()`.
     // router is VitePress' custom router. `siteData` is
     // a `ref` of current site-level metadata.
   }
-}
+} satisfies Theme