Upload media files onto third party site

[khanguslee]

Is your feature request related to a problem? Please describe.
Storing media files, such as images and video, on the git repository is not an ideal method of storing such assets. If someone were to clone the repository, downloading assets would take awhile.

Describe the solution you'd like
Some services we could use:

• https://www.netlifycms.org/docs/cloudinary/
• https://www.netlifycms.org/docs/uploadcare/
• https://www.netlifycms.org/docs/netlify-large-media/

Describe alternatives you've considered
N/A.