Script to render Images and captions

Is your feature request related to a problem? Please describe. Related to a sub-task of #2021. It would be useful to have a script to generate images and their captions. Something of this sort has already been done for chit-chat in #2035 (Updates in #2059) and can be used for reference.

Describe the solution you'd like The high level idea is the same as for conversation rendering:

• Generate an HTML string to do this
• Use headless chrome to get a PDF
• Use headless chrome to get png

Additional context @klshuster Could you provide a fixed format to process the data like there was in convo_render ? Also a rough vision of how you would want it to look like would be great. An idea would be: A polaroid like box in the center of the screen (grey/white background) with the caption in messenger blue below the image.