Allow use of base 64 encoded images with reference style in markdown

[kierandg]

Is this a bug report?

No, it is a feature request.

Have you read the Contributing Guidelines?

Yes

Request description

Markdown should accept images in base64 for small image. It's useful when we don't want to upload the image to anywhere in the server.

![Image alt text][image-id]

[image-id]:
data:image/png;base64,iVBORw....5CYII=

[JoelMarcey]

Hi @kierandg Is there anything special that we would need to do here other than support reference style linking as documented here: #257

[endiliey]

This issue is closed due to stale activity. Reference style linking has been supported as well.

If you think I might've closed it accidentally, please open up a new issue with new template.