docs: migrate to @nuxthq/ui-kit (#405)

Co-authored-by: Sébastien Chopin <seb@nuxt.com>

docs/content/6.overlays/3.popover.md

@@ -1,9 +1,12 @@
 ---
-github: true
 description: Display a non-modal dialog that floats around a trigger element.
-headlessui:
-  label: 'Popover'
-  to: 'https://headlessui.com/vue/popover'
+links:
+  - label: GitHub
+    icon: i-simple-icons-github
+    to: https://github.com/nuxtlabs/ui/blob/dev/src/runtime/components/overlays/Popover.vue
+  - label: 'Popover'
+    icon: i-simple-icons-headlessui
+    to: 'https://headlessui.com/vue/popover'
 ---
 
 ## Usage