Add Documenter site skeleton for MFIIDD

[sbfnk-bot]

Second half of seabbs's suggestion on #39: stand up a Documenter site for the package so qmd "see source" pointers can target rendered API docs rather than the source files directly.

Summary

• docs/Project.toml — Documenter + dev-linked MFIIDD.
• docs/make.jl — makedocs + deploydocs configured to publish under the api/ sub-path of the existing course gh-pages site so it sits alongside Quarto output without clobbering.
• docs/src/index.md — landing page with build instructions.
• docs/src/api.md — @autodocs reference for the MFIIDD module.
• .gitignore — exclude docs/build/ and docs/Manifest.toml.

Builds cleanly locally:

julia --project=docs -e 'using Pkg; Pkg.develop(path="."); Pkg.instantiate(); include("docs/make.jl")'

Out of scope

• Deployment from CI requires a workflow under .github/workflows/; I have not added it here. Wiring deploydocs into the existing deploy.yml (or a separate docs.yml) is a small follow-up that needs your call on the gh-pages layout.
• Updating the qmd "see source" links to point at the rendered API page is a follow-up that should land after Replace include= source dumps with MFIIDD.source_for #43 (the CodeTracking PR) merges so the qmd changes don't conflict.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/documenter-skeleton

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