Update the readme, rm recommends v0.9.0, and improve some descriptions. #78383

Job	Run time
Collect information about PR and source	12s
License and format	58s
Mirror third party dependencies	1m 1s
Find build cache	11s
Static analysis with clang on diff	14s
Build OneFlow (cu116)	9s
Build OneFlow (cpu)	9s
Build OneFlow (cpu-asan-ubsan)	9s
Build OneFlow (cpu-tsan)	11s
Build OneFlow (llvm15)	10s
Find test cache	10s
Find test cache (distributed)	0s
Test suite (cuda-module)	14s
Test suite (cuda-misc)	13s
Test suite (cuda-speed-test)	12s
Test suite (cpu-module)	12s
Test suite (cpu-misc)	12s
Distributed test suite	0s
	4m 37s

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