Merge branch 'protocol-sequence-diagrams' into 'develop'

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docs.nix

docs/_static/.gitignore

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docs/_templates/.gitignore

docs/conf.py

docs/dev/README.rst

docs/index.rst

docs/ops/README.rst

docs/ops/generating-keys.rst

docs/ops/monitoring.rst

docs/ops/service-dag-to-dashboard-order.dot

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docs/source/dev/architecture-overview.dot

nixos/system-tests.nix

nixos/unit-tests.nix

privatestorageio.nix