docs: landing title & description

docs/app/pages/index.vue

@@ -1,4 +1,8 @@
 <script setup lang="ts">
+useSeoMeta({
+  title: 'Nuxt Content made easy for Vue Developers',
+  description: 'Nuxt Content reads the content/ directory in your project, parses .md, .yml, .csv and .json files to create a powerful data layer for your application. Use Vue components in Markdown with the MDC syntax.',
+})
 const { data: page } = await useAsyncData('index', () => queryCollection('content').first())
 if (!page.value) {
   throw createError({ statusCode: 404, statusMessage: 'Page not found', fatal: true })