Fix installation and usage instructions in README.md #833

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Run time

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Job	Run time
Build only sysroot	16m 11s
Build x86_64-linux	1h 40m 59s
Build arm64-linux	1h 52m 18s
Build arm64-macos	1h 2m 5s
Build x86_64-macos	56m 23s
Build x86_64-windows	2h 22m 46s
Finalize wasi-sdk artifacts	12m 29s
Test standalone toolchain	5m 10s
	8h 28m 21s