docs: Restructure documentation with separate introduction section #212

Job	Run time
PR title check	3s
Tests / Integration tests (3.14, ubuntu-latest)	2m 59s
Code checks / Spell check	7s
Code checks / Actions lint check	30s
Tests / Integration tests (3.10, ubuntu-latest)	2m 53s
Doc checks / Doc checks / Docs check	1m 2s
Tests / E2E tests (3.10, ubuntu-latest)	4m 30s
Code checks / Lint check / Lint check (3.12)	11s
Code checks / Lint check / Lint check (3.13)	11s
Code checks / Lint check / Lint check (3.14)	12s
Code checks / Type check / Type check (3.11)	11s
Code checks / Lint check / Lint check (3.11)	10s
Code checks / Lint check / Lint check (3.10)	10s
Code checks / Type check / Type check (3.14)	13s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 36s
Code checks / Type check / Type check (3.10)	11s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	1m 0s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	55s
Code checks / Type check / Type check (3.12)	11s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 30s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	55s
Code checks / Type check / Type check (3.13)	13s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 28s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 36s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	1m 34s
Tests / E2E tests (3.14, ubuntu-latest)	5m 6s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	57s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	58s
	31m 32s

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