Readme update & cleanup #1108

Job	Run time
type-check	39s
lint	35s
end-to-end-test (ubuntu-20.04, local)	49s
unit-test (ubuntu-20.04, 3.6)	1m 43s
end-to-end-test (ubuntu-20.04, ssh)	2m 18s
unit-test (ubuntu-20.04, 3.7)	1m 34s
end-to-end-test (ubuntu-20.04, docker)	7m 45s
unit-test (ubuntu-20.04, 3.8)	1m 46s
end-to-end-test (ubuntu-latest, local)	57s
unit-test (ubuntu-20.04, 3.9)	1m 41s
end-to-end-test (ubuntu-latest, ssh)	2m 9s
unit-test (ubuntu-20.04, 3.10)	1m 31s
end-to-end-test (ubuntu-latest, docker)	8m 4s
unit-test (ubuntu-20.04, 3.11)	1m 28s
end-to-end-test (macos-latest, local)	3m 14s
unit-test (ubuntu-latest, 3.7)	1m 39s
unit-test (ubuntu-latest, 3.8)	1m 30s
unit-test (ubuntu-latest, 3.9)	1m 29s
unit-test (ubuntu-latest, 3.10)	1m 41s
unit-test (ubuntu-latest, 3.11)	1m 26s
unit-test (macos-12, 3.11)	1m 36s
unit-test (windows-2022, 3.11)	2m 39s
tests-done	4s
	48m 17s

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