fix: use npm instead of pnpm for Vercel deployment

Author: FlyTia

package.json

@@ -2,7 +2,6 @@
   "name": "hugo-blox-academic-cv-starter",
   "version": "1.0.0",
   "private": true,
-  "packageManager": "pnpm@10.14.0",
   "description": "Academic CV starter template for Hugo Blox with Tailwind CSS v4",
   "scripts": {
     "dev": "hugo server --disableFastRender",

vercel.json

@@ -1,5 +1,5 @@
 {
   "buildCommand": "bash build.sh",
   "outputDirectory": "public",
-  "installCommand": "pnpm install"
+  "installCommand": "npm install"
 }