Request for Image Generations

[foobnix]

1. Please add the possibility to set prefix also for images (the same as for the document)
2. Please add the possibility to set relative image path (not full path)

for example <img src="prefix-IMAGE_ID.png />"

I want to use your library in my project
https://github.com/foobnix/LibreraReader

Thank you

[andiwand]

if you provide a PR for this feature i would merge it.