Cleanup examples (#16)

- Remove serverless example (it was basically dup of with-postgres)
- Add plugin (e.g. postgres) to example name
- Update all javascript examples and make sure they work
- Cleanup a bit of the ui in nextjs example

javascript/with-postgres/README.md

@@ -0,0 +1,13 @@
+# Postgres Example
+
+This example connects to a Postgres database with [node-pg](https://www.npmjs.com/package/pg).
+
+## How to use
+
+- Create a Railway project with the Postgres plugin
+- Connect to your Railway project with `railway init`
+- Run this example with `railway start`
+
+## Notes
+
+The SQL query being run simply fetches the current time in the database. It is located in `src/index.js`

javascript/with-postgres/index.js

@@ -1,8 +1,18 @@
 const pg = require("pg");
 
+// Connect to the database using the DATABASE_URL environment
+//   variable injected by Railway
 const pool = new pg.Pool();
-(async () => {
+
+const go = async () => {
+  // Query the database
   const res = await pool.query("SELECT NOW()");
+
+  // Print the result
   console.log(res.rows[0]);
+
+  // Close the database connection
   pool.end();
-})();
+};
+
+go();