Also, use find instead of gnu make wildcards to reach nested subdirs

OCI standard doesn't allow redefining the default shell
bash needed to be called explicitly, sourcing the rc file

Fix issue with last commit

Add extra 'sub' to each (sub)*section to give section to each notebook

main.rs was not being converted to tex because of a problem
with the wildcard usage in the Makefile

Note, there should now be no need to toggle the appendix

Create code listings with tex files.
Add Makefile rules for rust -> tex
~~update build container~~