Improve installation section in README #7434

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Job	Run time
macOS Clang	2m 10s
Clang 13 libc++	2m 57s
Clang 13 libstdc++	3m 24s
Clang 13 ASAN+UBSAN libstdc++	4m 12s
Clang 13 Release libstdc++	4m 10s
GCC 10	2m 59s
GCC 10 ASAN+UBSAN	4m 37s
GCC 10 Release	8m 44s
GCC 10 dev	7m 39s
MSVC	4m 31s
MSVC Release	4m 59s
	50m 22s