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/5.overlays/3.popover.md

@@ -0,0 +1,33 @@
+---
+github: true
+headlessui:
+  label: 'Popover'
+  to: 'https://headlessui.com/vue/popover'
+---
+
+## Usage
+
+::component-example
+#default
+:popover-example
+#code
+```vue
+<template>
+  <UPopover>
+    <UButton color="white" label="Open" trailing-icon="i-heroicons-chevron-down-20-solid" />
+
+    <template #panel>
+      <!-- Content -->
+    </template>
+  </UPopover>
+</template>
+```
+::
+
+## Props
+
+:component-props
+
+## Preset
+
+:component-preset