Add ability to make images larger

[kaitlinnewson]

In some cases, the images used in documentation are difficult to read depending on how they're embedded in the content. It would be great to have some way for readers to make the images larger, possibly in some kind of overlay window that magnifies the image.

It could also be as basic as making the images a link to the full view, e.g. like what is done here: https://wordpress.org/support/article/settings-permalinks-screen/.