feat: use unhead v2 (#549)

Co-authored-by: Anthony Fu <github@antfu.me>

README.md

@@ -92,7 +92,7 @@ Mocking up web app with <b>Vitesse</b><sup><em>(speed)</em></sup><br>
   - [`unplugin-vue-i18n`](https://github.com/intlify/bundle-tools/tree/main/packages/unplugin-vue-i18n) - unplugin for Vue I18n
 - [VueUse](https://github.com/antfu/vueuse) - collection of useful composition APIs
 - [`vite-ssg-sitemap`](https://github.com/jbaubree/vite-ssg-sitemap) - Sitemap generator
-- [`@vueuse/head`](https://github.com/vueuse/head) - manipulate document head reactively
+- [`@unhead/vue v2`](https://github.com/unjs/unhead) - manipulate document head reactively
 - [`vite-plugin-vue-devtools`](https://github.com/vuejs/devtools-next) - Designed to enhance the Vue developer experience.
 
 ### Coding Style