Generating recipe images
For the datapack information pages, you wil often see crafting or smelting examples. These are in an uniform format, so it all looks a little bit neater.
You can generate these images using This tool. Make sure to check the "Force number" checkbox
The standard format for naming these files in the wiki file storage is "<pagename>-<imagename>". For example "Datapack:Smelting_Recipes-iron_bars_to_nugget". This name will be automatically changed by the uploader to a "correct one", but this should also be used for the description (if you don't want to bother filling it in)
Usually images are put in tables etc with the image type "Frameless" under advanced settings.