Fix error filtering posts by category

src/pages/blog/category/[category].astro

@@ -13,7 +13,7 @@ export async function getStaticPaths() {
 
   return uniqueCategories.map((category) => {
     const filteredPosts = allPosts
-      .filter((post) => post.data.category.includes(category))
+      .filter((post) => post.data.category === category)
       .sort((a, b) => b.data.pubDate.valueOf() - a.data.pubDate.valueOf());
     return {
       params: { category },