improve docs: add vercel link and section props description

### Develop

Setup environment variables:
Link Vercel projects:

```
vercel login
vercel link --repo
```

Pull environment variables from Vercel:

```
vercel env --cwd apps/sanity --environment development pull
vercel env --cwd apps/storyblok --environment development pull
```

To develop all apps and packages, run the following command:

```
pnpm run dev
```

### Remote Caching

Turborepo can use a technique known as [Remote Caching](https://turborepo.org/docs/core-concepts/remote-caching) to share cache artifacts across machines, enabling you to share build caches with your team and CI/CD pipelines.

By default, Turborepo will cache locally. To enable Remote Caching you will need an account with Vercel. If you don't have an account you can [create one](https://vercel.com/signup), then enter the following commands:

```
pnpm dlx turbo login
```

This will authenticate the Turborepo CLI with your [Vercel account](https://vercel.com/docs/concepts/personal-accounts/overview).

Next, you can link your Turborepo to your Remote Cache by running the following command from the root of your turborepo:

```
pnpm dlx turbo link
```