Refactor `fetch-examples` script to only use async/await

[catarak]

Nature of issue?

• Existing feature enhancement

Feature enhancement details:

The file examples.js has been edited by many people over the years and could use a refactor. It uses callbacks, Promises, and async/await, and I think that it should be refactored to just use async/await.

[Swapnil-2001]

Hi @catarak can I take up this issue please?

[catarak]

@Swapnil-2001 absolutely!