Fix ReadTheDocs build failure caused by missing _static directory

[Copilot]

The ReadTheDocs build was failing because Sphinx's html_static_path referenced a non-existent _static directory, triggering a warning that was treated as an error by the -W flag in CI.

Changes

• Added docs/source/_static/ and docs/source/_templates/ directories with .gitkeep files to satisfy Sphinx configuration requirements
• These directories are standard Sphinx conventions for custom static assets and templates, initially empty until custom styling or templates are added

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• docs.python.org
  • Triggering command: /usr/bin/python3 /home/REDACTED/.local/bin/sphinx-build -b html source build/html (dns block)
  • Triggering command: /usr/bin/python3 /home/REDACTED/.local/bin/sphinx-build -b html source build/html -W --keep-going (dns block)

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• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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