docs: Restructure documentation with separate introduction section #214

Job	Run time
PR title check	5s
Code checks / Actions lint check	34s
Code checks / Spell check	5s
Doc checks / Doc checks / Docs check	1m 3s
Tests / Integration tests (3.10, ubuntu-latest)	2m 33s
Code checks / Type check / Type check (3.13)	12s
Code checks / Lint check / Lint check (3.14)	11s
Tests / E2E tests (3.10, ubuntu-latest)	4m 2s
Code checks / Lint check / Lint check (3.12)	13s
Code checks / Lint check / Lint check (3.13)	10s
Code checks / Lint check / Lint check (3.11)	11s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 33s
Code checks / Type check / Type check (3.11)	10s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	2m 26s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	57s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 37s
Code checks / Type check / Type check (3.14)	11s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	56s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	54s
Code checks / Lint check / Lint check (3.10)	11s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 30s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	53s
Code checks / Type check / Type check (3.12)	12s
Tests / Integration tests (3.14, ubuntu-latest)	1m 42s
Code checks / Type check / Type check (3.10)	10s
Tests / E2E tests (3.14, ubuntu-latest)	1s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	1m 25s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	55s
	25m 2s

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