Initial drafts of model, parameters tutorials

[akilnarayan]

I'd like some feedback on how to solve some problems I've come up against in my initial sphinx tutorials. Mainly I want to look at stuff in docs/tutorials/models.md and docs/tutorials/parameters.md. The problem is that at present Sphinx does not render things as I'd like. Here are the current issues I have on my local machine:

• making inline (in text) equations. Markdown suggests that I can write something like $x$, but that doesn't render for me. Regular equations (e.g., with \begin{equation}) work ok
• making tables. In models.md there is a table I tried to make about halfway through the source based on some things I found online, but the result is not rendered
• citations and references. For a test I've tried a test citation in models.md (after the table). According to the sphinx doc, I modified conf.py to include an extension sphinxcontrib.bibtex and point to the bib source (here references.bib). But it's not working and I can't tell what I did wrong. (I did not try to use pandoc as suggested in the template since I couldn't figure out how to use pandoc with sphinx)

[akilnarayan]

I fixed the inline equations issue. I still can't create tables, but I just avoided doing that for now. (Seems we're using Commonmark for the interpreter, but I couldn't find out how to create tables with Commonmark.)

I also still can't create citations, but there is just one hanging one for now, and that can probably be fixed later.

So for now I'll make this a genuine pull request for merging. Future pulls can probably iron out all these details.

[jessdtate]

I think I have tables working in the examples if you want to try to get it in this PR. https://uncertainsci--70.org.readthedocs.build/en/70/tutorials/template.html#tables