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feat(site): a header on every page, and navigation for the docs (phas… #47

Job	Run time
no em dashes in the docs or the report strings	3s
ubuntu-latest / Python 3.13	1m 6s
the built wheel installs and runs	14s
windows-latest / Python 3.12	1m 32s
windows-latest / Python 3.13	1m 44s
ubuntu-latest / Python 3.12	1m 21s
quickstart, as the README documents it	19s
	6m 19s