Fix: main README.md overhaul #2911

Job	Run time
build-macos (macos-13)	35s
build-macos (macos-13, gcc@11)	1m 10s
build-macos (macos-14)	22s
build-mingw (windows-2022, mingw64)	1m 32s
build-macos (macos-13, gcc@12)	1m 11s
build-macos (macos-latest)	24s
build-linux (jammy, 96b_carbon)	52s
build-mingw (windows-2022, ucrt64)	1m 35s
build-macos (macos-13, gcc@13)	1m 12s
build-linux (jammy, blackpill-f401cc)	37s
build-mingw (windows-2022, clang64)	1m 34s
build-macos (macos-13, gcc@14)	1m 16s
build-linux (jammy, blackpill-f401ce)	39s
build-msvc (meson, windows-2022)	1m 5s
build-macos (macos-14, gcc@11)	1m 4s
build-linux (jammy, blackpill-f411ce)	32s
build-macos (macos-14, gcc@12)	38s
size-diff	43s
build-linux (jammy, bluepill)	36s
build-macos (macos-14, gcc@13)	46s
build-linux (jammy, ctxlink)	38s
build-macos (macos-14, gcc@14)	55s
build-linux (jammy, f072)	53s
build-linux (jammy, f3)	31s
build-linux (jammy, f4discovery)	38s
build-linux (jammy, hydrabus)	39s
build-linux (jammy, launchpad-icdi)	32s
build-linux (jammy, native)	32s
build-linux (jammy, native-uncommon)	57s
build-linux (jammy, native-st-clones)	34s
build-linux (jammy, native-riscv)	35s
build-linux (jammy, native-remote)	33s
build-linux (jammy, stlink)	31s
build-linux (jammy, stlinkv3)	46s
build-linux (jammy, swlink)	31s
	28m 8s

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