Images should be moved into source control

[Preston159]

In order to ensure images in the documentation stay available, external images should be coped into /docs/img/ where possible and their references in the documentation should be updated. The organizational structure which already exists in the img folder should be followed as closely as possible.

As the repository currently stands, there may be an issue with the licensing of images. I'll look into fixing that and update this issue later.

[Preston159]

@BrandonItaly Thoughts on this?

[BrandonItaly]

That sounds good!