Add Autogenerated API Reference

[darksim33]

Add Autogenerated API Reference

Problem

Pyneapple's API documentation is manually written. As the codebase grows, maintaining consistency becomes difficult.

Proposed Solution

Use mkdocstrings to automatically generate API docs from docstrings.
Why mkdocstrings:

• Integrates with existing mkdocs
• Markdown output (matches current docs style)
• Auto-updates from docstrings on each build

API Surface to Document

• Models: MonoExpModel, BiExpModel, TriExpModel, NNLSModel
• Solvers: CurveFitSolver, ConstrainedCurveFitSolver, NNLSSolver
• Fitters: PixelWiseFitter, SegmentedFitter, SegmentationWiseFitter, IDEALFitter
• I/O: load_dwi_nifti, save_parameter_map, load_config, etc.
• Utilities: validation functions, spectrum tools, plotting

Implementation

pip install mkdocstrings mkdocstrings-python
Then add to mkdocs.yml:
plugins:
  - mkdocstrings:
      handlers:
        python:
          options:
            show_root_heading: true