Reorder and tweak README.md sections #4253

Job	Run time
Build, rustfmt, and python lint	2m 5s
python3.8-x64 macOS-latest	4m 19s
python3.8-x64 ubuntu-latest	4m 21s
python3.8-x64 windows-latest	5m 59s
python3.9-x64 macOS-latest	5m 7s
python3.9-x64 ubuntu-latest	3m 14s
python3.9-x64 windows-latest	5m 47s
python3.10-x64 macOS-latest	4m 2s
python3.10-arm64 macOS-14	3m 1s
python3.10-x64 ubuntu-latest	3m 35s
python3.10-x64 windows-latest	4m 55s
python3.11-x64 macOS-latest	5m 5s
python3.11-arm64 macOS-14	2m 26s
python3.11-x64 ubuntu-latest	3m 23s
python3.11-x64 windows-latest	5m 32s
python3.12-x64 macOS-latest	8m 2s
python3.12-arm64 macOS-14	2m 33s
python3.12-x64 ubuntu-latest	4m 5s
python3.12-x64 windows-latest	7m 4s
python3.8-x64 ubuntu-latest MSRV	7m 22s
Build Docs	6m 26s
Coverage	2m 31s
python-stubs-3.8	2m 20s
python-stubs-3.9	2m 17s
python-stubs-3.10	2m 40s
python-stubs-3.11	2m 34s
	1h 50m 45s

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