docs(content): move shortcuts into composables/

docs/content/3.components/command-palette.md

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+---
+title: CommandPalette
+description: Add a customizable command palette to your app.
+links:
+  - label: Radix Vue
+    icon: i-custom-radix-vue
+    to: https://www.radix-vue.com/components/combobox.html
+  - label: GitHub
+    icon: i-simple-icons-github
+    to: https://github.com/nuxt/ui/blob/dev/src/runtime/components/CommandPalette.vue
+---
+
+## Usage
+
+## Examples
+
+## API
+
+### Props
+
+:component-props
+
+### Slots
+
+:component-slots
+
+### Events
+
+:component-events
+
+## Theme
+
+:component-theme