Example upload update

[lauri-codes]

Hi!

Just wanted to mention that you can now include online data directly in the example upload resources, without having to have a special download.archive.yaml file..

You can read more on this here, but essentially just include an url in the example upload resources with an optional download location.

[lukaspie]

Hi, thanks for the suggestion.

I think the idea was also to use this example to show people that you can download files using the download.archive.yaml file, so maybe it's worth keeping. But I guess @rettigl would know more.