Add docs

[rartino]

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[Copilot]

Pull request overview

Adds initial Sphinx documentation scaffolding for httk-web, including an API reference (autodoc) and a GitHub Pages deployment workflow.

Changes:

• Introduces Sphinx docs structure (index, “How It Works”, and API reference pages).
• Adds Sphinx configuration (docs/conf.py) enabling autodoc/autosummary and the Furo theme.
• Adds a GitHub Actions workflow to build and deploy docs to GitHub Pages.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
docs/index.rst	Adds docs landing page and toctree.
docs/how_it_works.rst	Documents runtime flow, directory layout, and compatibility mode.
docs/reference.rst	Adds autodoc-based API reference pages.
docs/conf.py	Sphinx configuration for autodoc/theme/extensions.
.github/workflows/docs.yml	CI workflow intended to build and deploy docs to GitHub Pages.

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