📚 update docs for all parameters

[jacksund]

• makes progress on Rework docstrings for workflows #147

@scott-materials @laurenmm @becca9835

This PR will help a bunch with figuring out workflow parameters and how to use them. Once it's merged, you'll want to read through the documentation for the workflow module. (try this link after merging and it will bring you right to the relevant section).

I think there are a lot of features that I've built into the workflow yaml files that are overlooked because the documentation is difficult to find for each workflow. For example, one cool feature that I don't think anyone knows about is that you can run a workflow with a materials project structure -- without ever going to their website or even making a cif/poscar file:

workflow_name: static-energy.vasp.mit
structure:
    database_table: MatprojStructure
    database_id: mp-1234

Definitely read through the structure parameter setting once this is merged.