point prisma to vercel postgres

prisma/schema.prisma

@@ -1,11 +1,13 @@
 generator client {
-  provider = "prisma-client-js"
+  provider        = "prisma-client-js"
+  previewFeatures = ["jsonProtocol"]
 }
 
 datasource db {
-  provider     = "mysql"
-  url          = env("DATABASE_URL")
-  relationMode = "prisma"
+  provider          = "postgresql"
+  url               = env("POSTGRES_PRISMA_URL")
+  directUrl         = env("POSTGRES_URL_NON_POOLING")
+  shadowDatabaseUrl = env("POSTGRES_URL_NON_POOLING")
 }
 
 model hits {