docs(navigation): fix example link

Author: ThornWalli

docs/.vitepress/navigation.js

@@ -2,7 +2,7 @@ export default {
   nav: [
     { text: 'Home', link: '/' },
     { text: 'Introduction', link: '/introduction' },
-    { text: 'Live Example', link: '/playground/' }
+    { text: 'Live Example', link: 'https://basics.github.io/vue-semantic-structure/playground/' }
   ],
 
   sidebar: [

docs/src/index.md

@@ -13,7 +13,7 @@ hero:
       link: /introduction
     - theme: alt
       text: Live Example
-      link: /playground/
+      link: https://basics.github.io/vue-semantic-structure/playground/
 
 features:
   - title: Heading