Generalize script for parsing markdown from Zotero HTML exports

[emilyhopkins]

Currently the SIMSSA and DDMAL sites parse HTML from Zotero to turn it into Markdown

There are three scripts, all based on the one Evan Savage wrote for the SIMSSA site

They work on the SIMSSA folders, the DDMAL folders, and the OMR Bibliography

Ideally it would all be one script, but I didn't get around to finishing it! Wanted to leave a note since the current situation, while functional, is a little confusing.