Add images to illustrate the different options in f3d website

[mwestphal]

Context
F3D has a great website but not many illustration of the options.

Lets add logic to generate images to illustrate the different options in f3d website
with a new web image comparison framework.

Suggested solution

• Add logic in website generation to use F3D with/without an option to generate images with a standard model
• Display the resulting images with a small comparison widget in the website
• It should be automated and easy to add new images