Add Pagefind search, sort posts by update time, link DigiKedai bot repo

src/pages/index.astro

@@ -4,9 +4,9 @@ import PostList from '../components/PostList.astro';
 import { getCollection } from 'astro:content';
 import { isEn } from '../lib/lang';
 import { SITE } from '../config';
+import { sortByUpdated } from '../lib/sort';
 
-const posts = (await getCollection('posts', isEn))
-  .sort((a, b) => b.data.pubDate.valueOf() - a.data.pubDate.valueOf());
+const posts = sortByUpdated(await getCollection('posts', isEn));
 ---
 
 <BaseLayout title={SITE.title} description={SITE.description}>