Fix installation and usage instructions in README.md #834

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Run time

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Job	Run time
Build only sysroot	15m 25s
Build x86_64-linux	24m 29s
Build arm64-linux	6m 31s
Build arm64-macos	1h 9m 53s
Build x86_64-macos	46m 17s
Build x86_64-windows	40m 11s
Finalize wasi-sdk artifacts	10m 59s
Test standalone toolchain	5m 28s
	3h 39m 13s