Clicking on image should bring up preview popup or link directly to photo

[emilieroberts]

Some images in the docs, screenshots specifically, have small text that can be difficult to read on some screens. It would be nice to have the ability to click on the image to popup a preview window, or link directly to the image. (See medium for an example of what this could look like).

[Snugug]

Going to write a transform that will link all in-body images to their full-size version