docs: add "The Duroxide family" cross-link section to README #31

Job	Run time
windows (x86_64-pc-windows-msvc)	7m 2s
sdist	20s
linux (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	3m 43s
macos (aarch64-apple-darwin)	2m 39s
linux (ubuntu-latest, x86_64-unknown-linux-gnu)	3m 36s
macos (x86_64-apple-darwin)	2m 44s
Smoke (local) windows-latest py3.12	1m 3s
Publish to PyPI	0s
Smoke (registry) ${{ matrix.os }} py${{ matrix.python }}	-1s
Report registry smoke failure	-1s
	21m 5s

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