docs(accordion): add drag and drop example (#3684)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

docs/app/components/content/examples/accordion/AccordionDragAndDropExample.vue

@@ -0,0 +1,33 @@
+<script setup lang="ts">
+import type { AccordionItem } from '@nuxt/ui'
+import { useSortable } from '@vueuse/integrations/useSortable'
+
+const items = shallowRef<AccordionItem[]>([
+  {
+    label: 'Icons',
+    icon: 'i-lucide-smile',
+    content: 'You have nothing to do, @nuxt/icon will handle it automatically.'
+  },
+  {
+    label: 'Colors',
+    icon: 'i-lucide-swatch-book',
+    slot: 'colors' as const,
+    content: 'Choose a primary and a neutral color from your Tailwind CSS theme.'
+  },
+  {
+    label: 'Components',
+    icon: 'i-lucide-box',
+    content: 'You can customize components by using the `class` / `ui` props or in your app.config.ts.'
+  }
+])
+
+const accordion = useTemplateRef<HTMLElement>('accordion')
+
+useSortable(accordion, items, {
+  animation: 150
+})
+</script>
+
+<template>
+  <UAccordion ref="accordion" :items="items" />
+</template>