fix: wrong Git clone command & package/tsconfig.json configuration

[TechQuery]

Description

@vercel

Document bug

git clone can't download a GitHub folder, so the command in this Example's ReadMe will throw error:

$ git clone https://github.com/vercel/examples/tree/main/solutions/node-hello-world
Cloning into 'node-hello-world'...
fatal: repository 'https://github.com/vercel/examples/tree/main/solutions/node-hello-world/' not found

A Node.js CLI tool get-git-folder is a good alternative.

Configuration bug

If you run vercel dev in Node.js LTS (18+), and then call http://localhost:3000/api/hello, it will throw an error:

Error: Cannot use import statement outside a module

so, ESM is first choice for new Node.js projects.

But, TS with ESM will failed after deployment:

ReferenceError: exports is not defined in ES module scope
This file is being treated as an ES module because it has a '.js' file extension and '/var/task/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.
    at file:///var/task/api/hello.js:2:23
    at ModuleJob.run (node:internal/modules/esm/module_job:194:25)
INIT_REPORT Init Duration: 234.46 ms	Phase: init	Status: error	Error Type: Runtime.ExitError
ReferenceError: exports is not defined in ES module scope
This file is being treated as an ES module because it has a '.js' file extension and '/var/task/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.
    at file:///var/task/api/hello.js:2:23
    at ModuleJob.run (node:internal/modules/esm/module_job:194:25)
INIT_REPORT Init Duration: 278.17 ms	Phase: invoke	Status: error	Error Type: Runtime.ExitError
Error: Runtime exited with error: exit status 1
Runtime.ExitError

so, a tsconfig.json in /api is required: vercel/vercel#10317 (comment)

Finally, a Hello World of Vercel Node.js serverless works.

Type of Change

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

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