Changed app to be on correct port (I think/hope)

src/server.ts

@@ -76,6 +76,8 @@ app.use(express.static(path.join(__dirname, 'public'), {
     }
 }));
 
-app.listen(3000, () => {
-    console.log('Server is running on port 3000');
+const port = process.env.PORT || 3000;
+
+app.listen(port, () => {
+    console.log(`Server is running on port ${port}`);
 });