Add seed documentation

[tuvaforrest]

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• [x] I have added at least one Github label to this PR (bug, enhancement, breaking change,...)
• [x] My code follows style guidelines
• [x] (New models) YAML files are categorized by sub folder and models listed in alphabetical order
• [x] (New models) I have added a config to each new model to enable it for claims and/or clinical data
• [x] (New models) I have added the variable tuva_last_run to the final output
• [ ] (Optional) I have recorded a Loom to explain this PR

Package release checklist

• [x] I have updated dbt docs
• [ ] I have updated the version number in the dbt_project.yml

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