docs: Restructure documentation with separate introduction section #134

Job	Run time
PR title check	5s
Code checks / Spell check	7s
Code checks / Actions lint check	29s
Code checks / Type check / Type check (3.12)	14s
Code checks / Lint check / Lint check (3.11)	11s
Code checks / Lint check / Lint check (3.10)	12s
Code checks / Lint check / Lint check (3.13)	10s
Doc checks / Doc checks / Docs check	1m 5s
Code checks / Type check / Type check (3.14)	16s
Code checks / Lint check / Lint check (3.12)	11s
Code checks / Type check / Type check (3.11)	11s
Code checks / Type check / Type check (3.10)	16s
Code checks / Type check / Type check (3.13)	10s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 28s
Code checks / Lint check / Lint check (3.14)	12s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	59s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	51s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 32s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 22s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	54s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 21s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	1m 17s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	52s
Tests / Integration tests / Integration tests (ubuntu-latest, 3.14)	6m 16s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	57s
Tests / Integration tests / Integration tests (ubuntu-latest, 3.10)	4m 41s
	26m 19s

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