I've stubbed out each file for this commit. I need to go in and write the main
content for them all (apart from sql-statements.org). I was originally going to
put a breakdown of what each (Python) script does in the wiki but I changed my
mind. The wiki, used by Gitea, doesn't allow .org files and I quite like the
option to run code in any of the (doc) files if needed (using org-babbel).
I need to update README.org to reflect this change.