Add documentation for Zodiac
We need a "manual" for Zodiac that should include:
- The equations being solved
- An overview of the solution method, with references to Mike's papers on \Psi-tc
- Summary of input parameters and description of how to use zodiac
- Instructions on using the post-processing tools.
We should write this in LaTeX, and then I can probably set up the CI to build the docs automatically.
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