Fix CI runner path (absolute); use relative logo path + add badges #6

Job	Run time
unit (ubuntu-latest)	12s
unit (windows-latest)	1m 6s
integration (macos-latest, haybarn_unittest-osx-arm64.zip)	18s
integration (windows-latest, haybarn_unittest-windows-amd64.zip)	38s
unit (macos-latest)	18s
integration (ubuntu-latest, haybarn_unittest-linux-amd64.zip)	38s
	3m 10s

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