feat: rewrite to use app config and rework docs (#143)

Co-authored-by: Daniel Roe <daniel@roe.dev>
Co-authored-by: Sébastien Chopin <seb@nuxt.com>

docs/content/2.elements/4.dropdown.md

@@ -0,0 +1,56 @@
+---
+github: true
+headlessui:
+  label: 'Menu'
+  to: 'https://headlessui.com/vue/menu'
+---
+
+## Usage
+
+::component-example
+#default
+:dropdown-example
+
+#code
+```vue
+<script setup>
+const items = [
+  [{
+    label: 'Profile',
+    avatar: {
+      src: 'https://avatars.githubusercontent.com/u/739984?v=4'
+    }
+  }], [{
+    label: 'Edit',
+    icon: 'i-heroicons-pencil-square-20-solid'
+  }, {
+    label: 'Duplicate',
+    icon: 'i-heroicons-document-duplicate-20-solid'
+  }], [{
+    label: 'Archive',
+    icon: 'i-heroicons-archive-box-20-solid'
+  }, {
+    label: 'Move',
+    icon: 'i-heroicons-arrow-right-circle-20-solid'
+  }], [{
+    label: 'Delete',
+    icon: 'i-heroicons-trash-20-solid'
+  }]
+]
+</script>
+
+<template>
+  <UDropdown :items="items" :popper="{ placement: 'bottom-start' }">
+    <UButton color="white" label="Options" trailing-icon="i-heroicons-chevron-down-20-solid" />
+  </UDropdown>
+</template>
+```
+::
+
+## Props
+
+:component-props
+
+## Preset
+
+:component-preset