Add images to the publications

[edwardabraham]

We can use the image pipeline to make teaser images for the publications. These could be used on the publications page, and in the summary page, to make the page a bit more interesting.

Here is a commandline example:
convert -density 100 content/publications/pdf/waugh_stirring_2008.pdf -resize 256x256^ -crop 256x256+0+0 ~/Desktop/waugh_stirring_2008.png

This could be integrated into the image processing pipeline in Site.hs. However, at the moment there is no way to change the output format of the processed files. We need the output format to be a png.

It would also be simpler if all the pdfs had the publication key for their filename. The pdf parameter would not then be needed in the YAML as it could be derived from the key. This would make the logic for finding the PNGs easier.

[github-actions]

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