Add ReadTheDocs Documentation Site

[SameerSamji]

Background

SciKGExtract currently has no hosted documentation. There is no structured reference site covering architecture, configuration, API reference, or tutorials. A ReadTheDocs site is needed so that external users can understand and adopt the framework without reading source code directly.

Proposed Work

4.1 Documentation Sections to Write

Section	Source Material
Getting Started	Expand root README.md → install, .env setup, first extraction
Architecture Overview	Orchestrator/agents diagram of the LangGraph workflow
Configuration Guide	OrchestratorConfig, WorkflowConfig, ExtractionConfig, etc.
LLM Provider Setup	OpenAI / SAIA / Ollama / HuggingFace setup, API key config
Custom Schemas	How to define JSON schemas, configure ProcessConfig
Normalization	PubChem LMDB setup, NormalizationConfig JSONPaths
Evaluation Guide	LLM-as-Judge, quantitative metrics, PubChem normalized evaluation
API Reference	Auto-generated via sphinx-autoapi from scikg_extract/
Tutorials	Notebooks rendered as docs via nbsphinx
Contributing	Expand CONTRIBUTING.md

4.2 Docstring Pass

Add docstrings to all public functions in:

• scikg_extract/evaluation/
• scikg_extract/tools/
• scikg_extract/agents/
  ...

These are the user-facing modules that sphinx-autoapi will render into the API Reference section.