feat: add v3 banner

Author: mychidarko

.vitepress/theme/index.ts

@@ -15,8 +15,8 @@ export default {
   },
   Layout() {
     return h(DefaultTheme.Layout, null, {
-      // 'layout-top': () =>
-      //   h(defineAsyncComponent(() => import('./components/shared/Banner.vue'))),
+      'layout-top': () =>
+        h(defineAsyncComponent(() => import('./components/shared/Banner.vue'))),
       // 'aside-ads-before' : () =>
       //   h(defineAsyncComponent(() => import('./components/shared/Paperplane.vue'))),
         // h(defineAsyncComponent(() => import('./components/shared/GPTLink.vue'))),