Improve documentation of module types

[jamesaoverton]

I noticed that the docs here https://github.com/INCATools/ontology-development-kit/blob/master/docs/project-schema.md don't reflect all the options in the Makefile template here https://github.com/INCATools/ontology-development-kit/blob/master/template/src/ontology/Makefile.jinja2#L418, or explain what the options mean. Maybe this is documented somewhere else...

[matentzn]

I am starting to update docs her #975 and in various slack channels, but nothing concrete yet to address your question. Thank you for making the issue!