Core

Simplify README even more #5625

Job	Run time
test (macos-latest, clang, clang++, static, sh, macos/llvm)	5m 46s
test (macos-latest, clang, clang++, shared, sh)	2m 55s
test (macos-latest, gcc-13, g++-13, static, sh, macos/gcc)	10m 5s
test (ubuntu-latest, clang, clang++, static, sh, linux/llvm)	6m 0s
test (ubuntu-latest, gcc, g++, static, sh, linux/gcc)	10m 0s
test (ubuntu-latest, clang, clang++, shared, sh)	5m 0s
test (ubuntu-latest, gcc, g++, shared, sh)	4m 46s
test (windows-latest, static, pwsh, windows/msvc)	9m 25s
test (windows-latest, shared, pwsh)	7m 23s
test (ubuntu-latest, clang, clang++, static, sh, -DSOURCEMETA_CORE_ADDRESS_SANITIZER:BOOL=ON)	5m 39s
test (ubuntu-latest, clang, clang++, static, sh, -DSOURCEMETA_CORE_UNDEFINED_SANITIZER:BOOL=ON)	5m 57s
	1h 12m 56s

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