Refactor OG image generation in various pages and update package dependencies

content.config.ts

@@ -1,10 +1,23 @@
-import { defineContentConfig, defineCollection } from '@nuxt/content'
+import { defineCollection, defineContentConfig } from '@nuxt/content'
+import { asRobotsCollection } from '@nuxtjs/robots/content'
+import { asSitemapCollection } from '@nuxtjs/sitemap/content'
+import { asOgImageCollection } from 'nuxt-og-image/content'
 
 export default defineContentConfig({
   collections: {
     content: defineCollection({
-      type: 'page',
-      source: '**/*.md',
+      ...asRobotsCollection({
+        type: 'page',
+        source: '**/*.md',
+      }),
+      ...asSitemapCollection({
+        type: 'page',
+        source: '**/*.md',
+      }),
+      ...asOgImageCollection({
+        type: 'page',
+        source: '**/*.md',
+      }),
     }),
   },
 })