Clean up and restructure documentation

[Copilot]

Description

Consolidates scattered documentation files and removes build artifacts. Eliminates duplicate guide files between root and docs/ directories, organizes reference guides into a dedicated subdirectory, and establishes single source of truth for all documentation.

Changes:

• Removed artifacts: docs/node_modules/, docs/yarn.lock + .gitignore update
• Consolidated API docs: Renamed api_docs.md → api.md, moved manual reference to guides/python-api-guide.md
• Organized guides: Created docs/guides/ for setup/configuration docs (GitHub Pages, Settings, Streamlit)
• Removed duplicates: Deleted root-level guide files now in docs/guides/
• Updated structure: Enhanced README, fixed all internal links, added contributor guidelines in docs/about-docs.md

New structure:

docs/
├── api.md              # Auto-generated API reference
├── guides/             # Setup & configuration guides
│   ├── python-api-guide.md
│   ├── streamlit-guide.md
│   ├── github-pages-setup.md
│   └── github-settings-guide.md
└── about-docs.md       # Contributor guidelines

Validation: mkdocs build --strict passes with 0 warnings.

Checklist

• Tests covering the new functionality have been added
• Documentation has been updated OR the change is too minor to be documented
• Changes are listed in the CHANGELOG.md OR changes are insignificant

Original prompt

Create a PR to clean up and structure the docs.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.