Add Sphinx autodoc API reference to ReadTheDocs

[Copilot]

ReadTheDocs only rendered the README. This adds full API reference docs auto-generated from source docstrings via Sphinx autodoc.

Changes

docs/conf.py

• Add sys.path setup so autodoc can import the src package
• Enable sphinx.ext.autodoc, sphinx.ext.napoleon (Google-style docstrings), and sphinx.ext.viewcode
• Configure autodoc defaults: members, undoc-members, show-inheritance

docs/api/ (new)

• index.rst — API overview toctree
• cli.rst, utils.rst, data_sources.rst, reports.rst — per-module autodoc pages; data_sources and reports cover all sub-modules individually

docs/index.md

• Add toctree entry pointing to api/index

.readthedocs.yaml

• Install requirements/base.txt in addition to requirements/docs.txt so autodoc can successfully import source modules (pandas, requests, orjson, etc.) during the RTD build

Original prompt

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This section details on the original issue you should resolve

<issue_title>Extend readthedocs to also include API documentation via sphinx</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Extend readthedocs to also include API documentation via sphinx #20

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