use new vercel config

vercel.json

@@ -1,36 +1,45 @@
 {
+  "version": 2,
   "builds": [
     {
-      "src": "www/libx/package.json",
-      "use": "@vercel/static-build",
+      "src": "api/libx/app.py",
+      "use": "@vercel/python",
       "config": {
-        "installCommand": "yarn install",
-        "buildCommand": "yarn build",
-        "outputDirectory": "www/libx/dist"
+        "runtime": "python3.9",
+        "maxLambdaSize": "15mb",
+        "buildCommand": "pip install pipenv && pipenv install --deploy",
+        "startCommand": "ENV=production FLASK_APP=libx/app.py FLASK_RUN_HOST=0.0.0.0 FLASK_RUN_PORT=5000 flask run"
       }
     },
     {
-      "src": "libx/app.py",
-      "use": "@vercel/python",
+      "src": "www/libx/package.json",
+      "use": "@vercel/static-build",
       "config": {
-        "runtime": "python3.12",
-        "installCommand": "pip install pipenv && pipenv install --deploy",
-        "startCommand": "ENV=production FLASK_APP=libx/app.py FLASK_RUN_HOST=0.0.0.0 FLASK_RUN_PORT=5000 flask run"
+        "distDir": "dist",
+        "buildCommand": "yarn --cwd www/libx install && yarn --cwd www/libx build",
+        "outputDirectory": "www/libx/dist"
       }
     }
   ],
   "routes": [
     {
       "src": "/api/(.*)",
-      "dest": "/libx/app.py"
+      "dest": "/api/libx/app.py"
     },
     {
       "src": "/static/(.*)",
       "dest": "/www/libx/dist/$1"
     },
+    {
+      "handle": "filesystem"
+    },
     {
       "src": "/(.*)",
-      "dest": "/libx/app.py"
+      "dest": "/api/libx/app.py"
     }
-  ]
+  ],
+  "env": {
+    "FLASK_APP": "libx/app.py",
+    "FLASK_ENV": "production"
+  }
 }