External images in slideshows do not consider the publication file

[rbeezer]

Check the template matching image and condition on the existence of a generated directory. Good chance there maybe other similar failures to respect aspects of the publication file.

Obsoletes: PreTeXtBook/pretext-cli#717

[kcrisman]

Check the template matching image and condition on the existence of a generated directory. Good chance there maybe other similar failures to respect aspects of the publication file.

Commenting to see updates, as I'm still interested in modernizing some of the slideshow stuff (on the js side, at least). (I haven't been using generated or CLI on that project yet, for what it's worth, but I'm hoping to upgrade that before Spring 2025, the next time I teach that course.)

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