Update JavaScript examples to latest Railway (#14)

* update serverless pg example
* update nextjs example
* update prisma example

javascript/serverless/package.json

@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "global": "^4.4.0",
-    "railway": "^2.0.5",
+    "pg": "^8.4.0",
     "tslib": "^2.0.0"
   }
 }

javascript/serverless/src/index.js

@@ -1,6 +1,7 @@
-const pg = require("railway/pg");
+const pg = require("pg");
+const client = new pg.Pool();
 
-pg.query("SELECT now()", (err, res) => {
+client.query("SELECT now()", (err, res) => {
   if (err) {
     console.log(err);
   }
@@ -8,4 +9,4 @@ pg.query("SELECT now()", (err, res) => {
   console.log(res.rows);
 });
 
-pg.close();
+client.close();