docs(app): framework select global (#2719)

Co-authored-by: harlan <harlan@harlanzw.com>

docs/content/1.getting-started/2.installation/.navigation.yml

@@ -0,0 +1 @@
+shadow: true

docs/content/1.getting-started/2.installation/1.nuxt.md

@@ -1,16 +1,13 @@
 ---
-title: Install in a Nuxt app
+title: Installation
 description: 'Learn how to install and configure Nuxt UI in your Nuxt application.'
-select:
-  items:
-    - label: Nuxt
-      icon: i-logos-nuxt-icon
-      to: /getting-started/installation/nuxt
-    - label: Vue
-      icon: i-logos-vue
-      to: /getting-started/installation/vue
+navigation.framework: nuxt
 ---
 
+::callout{to="/getting-started/installation/vue" icon="i-logos-vue" class="hidden"}
+Looking for the **Vue** version?
+::
+
 ## Setup
 
 ::steps{level="4"}

docs/content/1.getting-started/2.installation/2.vue.md

@@ -1,16 +1,13 @@
 ---
-title: Install in a Vue app
+title: Installation
 description: 'Learn how to install and configure Nuxt UI in your Vue application.'
-select:
-  items:
-    - label: Nuxt
-      icon: i-logos-nuxt-icon
-      to: /getting-started/installation/nuxt
-    - label: Vue
-      icon: i-logos-vue
-      to: /getting-started/installation/vue
+navigation.framework: vue
 ---
 
+::callout{to="/getting-started/installation/nuxt" icon="i-logos-nuxt-icon" class="hidden"}
+Looking for the **Nuxt** version?
+::
+
 ## Setup
 
 ::steps{level="4"}
@@ -155,10 +152,6 @@ export default defineConfig({
 
 Use the `ui` option to provide configuration for Nuxt UI.
 
-::warning
-In the rest of the docs, there are references to the `app.config.ts` file (which is a Nuxt feature). When using Nuxt UI in a project without Nuxt, this configuration is passed in this `ui` option instead.
-::
-
 ```ts [vite.config.ts]
 import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'