feat: implement post search using Pagefind (#12)

package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "dev": "astro dev",
     "start": "astro dev",
-    "build": "astro build",
+    "build": "astro build && pagefind --site dist",
     "preview": "astro preview",
     "astro": "astro",
     "new-post": "node scripts/new-post.js",
@@ -23,6 +23,7 @@
     "colorjs.io": "^0.4.5",
     "mdast-util-to-string": "^4.0.0",
     "overlayscrollbars": "^2.4.6",
+    "pagefind": "^1.0.4",
     "reading-time": "^1.5.0",
     "rehype-autolink-headings": "^7.1.0",
     "rehype-katex": "^7.0.0",
@@ -31,7 +32,8 @@
     "sharp": "^0.32.6",
     "tailwindcss": "^3.3.7",
     "typescript": "^5.2.2",
-    "valine": "^1.5.1"
+    "valine": "^1.5.1",
+    "vue": "^3.4.15"
   },
   "devDependencies": {
     "@astrojs/ts-plugin": "^1.3.1",