Shrink images before embedding

Open Henry Heino requested to merge shrink-images-before-embed into master

Shrinks images using PIL prior to embedding. Output html files for Layout are now ≤ 3 MiB unzipped (as low as 700 KiB). As such, a follow-up MR can remove the zipping of the html file.

Example: student_output.html

Edited by Henry Heino

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