Fix pagefind search in prod by outputting under base path

docs-ui-kit loads pagefind from ${BASE_URL}/_pagefind/pagefind.js,
which resolves to /projects/react-searchable-dropdown/_pagefind/.
The old --output-subdir _pagefind placed files at dist/_pagefind/
(root), causing a 404 at runtime.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: luciodale

packages/docs/package.json

@@ -4,7 +4,7 @@
 	"type": "module",
 	"scripts": {
 		"dev": "astro dev",
-		"build": "astro build && bunx pagefind --site dist --output-subdir _pagefind",
+		"build": "astro build && bunx pagefind --site dist --output-subdir projects/react-searchable-dropdown/_pagefind",
 		"preview": "wrangler dev",
 		"deploy": "bun run build && wrangler deploy"
 	},