Move build-pdf.sh logic to config files

Created by: dtu-compute

Right now the logic for compiling each course is hard coded in build-pdf.sh, so changing can't be done easily.

What if we volumen mount /enote/vol/getpdf-scripts into /getpdf-scripts and instead of executing build-pdf.sh it executes /getpdf-scripts/$course?

That way the compile logic can be changed while the system is live.