refactor: update to AstroV2 and remove headings on search result

Update imports and types according to Astro v2 content collections. Remove headings on search result
for better search accuracy.

src/pages/search.astro

@@ -1,23 +1,22 @@
 ---
-import { SITE } from "src/config";
+import { getCollection } from "astro:content";
+import { SITE } from "@config";
 import Layout from "@layouts/Layout.astro";
 import Main from "@layouts/Main.astro";
 import Header from "@components/Header.astro";
 import Footer from "@components/Footer.astro";
 import Search from "@components/Search";
-import type { Frontmatter } from "src/types";
 
 // Retrieve all articles
-const posts = await Astro.glob<Frontmatter>("../contents/**/*.md");
+const posts = await getCollection("blog");
 
 // List of items to search in
 const searchList = posts
-  .filter(({ frontmatter }) => !frontmatter.draft)
-  .map(post => ({
-    title: post.frontmatter.title,
-    description: post.frontmatter.description,
-    headings: post.getHeadings().map(h => h.text),
-    frontmatter: post.frontmatter,
+  .filter(({ data }) => !data.draft)
+  .map(({ data }) => ({
+    title: data.title,
+    description: data.description,
+    data,
   }));
 ---