[Feature] Docs: Add a guide for Delivering Remote Images

# **Feature Request**

## **Is your feature request related to a problem? Please describe.**

Delivering Remote Images should describe two ways to handle remote images including the fetch API via:
```
deliveryType="fetch"
```

And using auto-upload via URL mapping

How: https://www.youtube.com/watch?v=LJhsn5A0PFE