docs: 2.4.0 release #279

Job	Run time
std::format none C++20 Clang-18 Release	1s
std::format none C++20 Clang-18 Debug	1s
std::format none C++23 Clang-18 Release	1s
std::format none C++23 Clang-18 Debug	1s
std::format gsl-lite C++20 Clang-18 Release	1s
std::format gsl-lite C++20 Clang-18 Debug	1s
std::format gsl-lite C++23 Clang-18 Release	1s
std::format gsl-lite C++23 Clang-18 Debug	1s
std::format ms-gsl C++20 Clang-18 Release	1s
std::format ms-gsl C++20 Clang-18 Debug	1s
std::format ms-gsl C++23 Clang-18 Release	1s
std::format ms-gsl C++23 Clang-18 Debug	1s
fmtlib none C++20 Clang-18 Release	1s
fmtlib none C++20 Clang-18 Debug	1s
fmtlib none C++23 Clang-18 Release	1s
fmtlib none C++23 Clang-18 Debug	1s
fmtlib gsl-lite C++20 Clang-18 Release	59s
fmtlib gsl-lite C++20 Clang-18 Debug	1m 1s
fmtlib gsl-lite C++23 Clang-18 Release	1m 2s
fmtlib gsl-lite C++23 Clang-18 Debug	1m 8s
fmtlib ms-gsl C++20 Clang-18 Release	1s
fmtlib ms-gsl C++20 Clang-18 Debug	1s
fmtlib ms-gsl C++23 Clang-18 Release	1s
fmtlib ms-gsl C++23 Clang-18 Debug	1s
	4m 30s

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