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It's a static site that is sourced from `https://git-wip-us.apache.org/repos/asf/incubator-airflow-site.git` on the `asf-site` branch.
This should point to latest stable, while readthedocs.org keeps track of versioned documentation.
To build the docs, run `python setup.py build_sphinx` from the main airflow project, this builds a static site under `docs/_build/html/`. You can then copy the content of this folder to root of the repo/branch mentioned above.
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