Here's a rough process that might work.

Convert existing models. Hopefully we've done all the hard work elsewhere, making this trivial. Load each stdpopsim model in turn, convert the msprime demography to a demes object, write the demes object to a file.
Organise the demes yaml files in a sensible way.
Change the model registration to instead query which yaml files are present for a given species. Or maybe we don't even need model registration anymore?
Change the model loading code to load the relevant yaml file.
Delete the code implementing models using the msprime API.
Update the tests that break.
Update the docs on how to write a demographic model.

convert demographic models to Demes YAML files #962

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