Additional training improvements

[hiker]

A tickets for training issues that need improvement over time:

• Add syntax highlights to all .md files, which will allow them to be converted to pdf using pandoc with line wrappings (without syntax highlighting pandoc will not wrap lines)
• Check if duplicated files can be shared using symlinks
• Evaluate the options to create a pdf file with all readmes, slides, ... using a script (e.g. pandoc for .md to .pdf) etc
• Remove all print statements from the solutions scripts, so that the log files are smaller.
• Check if we can use gfortran with omp offloading:
  "Nuno says: "I remember successfully testing with the tracer advection mini-app: gfortran -fopenmp -o output -foffload=nvptx-none="-march-map=sm_90" -Ofast output.f90"`