chore: change the tag schema mapping for supporting more files.

README.md

@@ -110,7 +110,7 @@ database.
 
 If you don't want the astro integration, change the switch in `options.ts` to `false`.
 
-```json
+```typescript
 {
   settings: {
     comments: {

src/helpers/schema.ts

@@ -61,11 +61,13 @@ export const categories: Category[] = categoriesCollection.map((cat) => ({
   permalink: `/cats/${cat.data.slug}`,
   ...cat.data,
 }));
-export const tags: Tag[] = tagsCollection[0].data.map((tag) => ({
+export const tags: Tag[] = tagsCollection.flatMap((tags) => {
+  return tags.data.map((tag) => ({
     counts: posts.filter((post) => post.tags.includes(tag.name)).length,
     permalink: `/tags/${tag.slug}`,
     ...tag,
   }));
+});
 
 // Find the missing categories from posts.
 const missingCategories: string[] = posts