Update express example to for zero config (#1209)

### Description

- Remove vercel.json and rewrite
- use `src/index.ts`

### Demo URL

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### Type of Change

- [ ] New Example
- [ ] Example updates (Bug fixes, new features, etc.)
- [ ] Other (changes to the codebase, but not to examples)

### New Example Checklist

- [ ] 🛫 `npm run new-example` was used to create the example
- [ ] 📚 The template wasn't used but I carefuly read the [Adding a new
example](https://github.com/vercel/examples#adding-a-new-example) steps
and implemented them in the example
- [ ] 📱 Is it responsive? Are mobile and tablets considered?

---------

Co-authored-by: Anthony Shew <[email protected]>

Author: ismaelrumzan

solutions/express/README.md

@@ -1,6 +1,6 @@
 # Express.js on Vercel
 
-Simple Express.js + Vercel example that serves html content, JSON data and simulates an api route.
+Basic Express.js + Vercel example that serves html content, JSON data and simulates an api route.
 
 ## How to Use
 
@@ -28,4 +28,4 @@ Then run the app at the root of the repository:
 
 ```bash
 vercel dev
-```
+```

solutions/express/package.json

@@ -1,16 +1,16 @@
 {
-	"name": "express",
-	"version": "1.0.0",
-	"description": "",
-	"main": "index.ts",
-	"scripts": {
-		"test": "echo \"Error: no test specified\" && exit 1",
-		"start": "node api/index.ts"
-	},
-	"keywords": [],
-	"author": "",
-	"license": "ISC",
-	"dependencies": {
-		"express": "^4.18.2"
-	}
+  "name": "express",
+  "version": "1.0.0",
+  "description": "",
+  "type": "module",
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@types/express": "^5.0.0",
+    "express": "^4.18.2"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0"
+  }
 }