Organize introductory pages #1894

Job	Run time
Downstream builds with Python 3.8	35s
CLI responsiveness with latest Python	2m 9s
Downstream builds with Python 3.9	44s
Downstream builds with Python 3.10	39s
Downstream builds with Python 3.11	44s
Python 3.8 on Linux	2m 39s
Downstream builds with Python 3.12	46s
Python 3.9 on Linux	3m 2s
Python 3.10 on Linux	2m 52s
Python 3.11 on Linux	3m 38s
Python 3.12 on Linux	3m 11s
Python 3.8 on Windows	7m 52s
Python 3.9 on Windows	6m 11s
Python 3.10 on Windows	7m 3s
Python 3.11 on Windows	6m 24s
Python 3.12 on Windows	5m 44s
Python 3.8 on macOS	3m 35s
Python 3.9 on macOS	3m 42s
Python 3.10 on macOS	4m 18s
Python 3.11 on macOS	5m 28s
Python 3.12 on macOS	5m 16s
Report coverage	0s
check	3s
	1h 16m 35s

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