fix: update DATABASE_URL placeholder for security reasons

.env.example

@@ -19,8 +19,7 @@ SECRET_KEY=CHANGE_ME_IN_PRODUCTION_USE_COMMAND_ABOVE
 # DATABASE - NEON POSTGRESQL (REQUIRED)
 # ════════════════════════════════════════════════════════════════════════════
 # Your connection string from Neon
-DATABASE_URL=postgresql://neondb_owner:npg_0hvkoPnReMz9@ep-rough-feather-aojsbj8l-pooler.c-2.ap-southeast-1.aws.neon.tech/neondb?sslmode=require&channel_binding=require
-
+DATABASE_URL=Get from Neon dashboard - format: postgresql://username:password@host:port/database
 # ════════════════════════════════════════════════════════════════════════════
 # FILE UPLOADS & STORAGE
 # ════════════════════════════════════════════════════════════════════════════