docs(readme): convert README.adoc -> Markdown README.md (#23) #39

Job	Run time
governance / Security policy checks	6s
governance / Well-Known (RFC 9116 + RSR)	6s
governance / Guix primary / Nix fallback policy	6s
governance / Language / package anti-pattern policy	12s
governance / Licence consistency	9s
governance / Trusted-base reduction policy	9s
governance / Check Workflow Staleness	9s
governance / Workflow security linter	3s
governance / Code quality + docs	15s
governance / Validate Hypatia Baseline	-1s
	1m 14s

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