docs: Restructure documentation with separate introduction section (#… #56

Job	Run time
Code checks / Actions lint check	28s
Code checks / Lint check / Lint check (3.11)	10s
Code checks / Type check / Type check (3.11)	10s
Code checks / Lint check / Lint check (3.12)	11s
Code checks / Type check / Type check (3.12)	11s
Doc checks / Doc checks / Docs check	56s
Code checks / Spell check	5s
Code checks / Lint check / Lint check (3.10)	11s
Code checks / Type check / Type check (3.13)	13s
Code checks / Lint check / Lint check (3.13)	14s
Code checks / Type check / Type check (3.10)	11s
Code checks / Type check / Type check (3.14)	15s
Code checks / Lint check / Lint check (3.14)	15s
Tests	0s
Release prepare	-1s
Changelog update	0s
PyPI publish	0s
Doc release post publish	0s
Doc release / Doc release	1m 11s
	4m 40s

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