docs: Add guide "HttpCrawler with custom parser" #40

Job	Run time
PR title check	4s
Code checks / Spell check	6s
Code checks / Actions lint check	29s
Doc checks / Doc checks / Docs check	1m 41s
Code checks / Lint check / Lint check (3.10)	26s
Code checks / Lint check / Lint check (3.11)	22s
Code checks / Lint check / Lint check (3.13)	23s
Code checks / Lint check / Lint check (3.12)	23s
Code checks / Lint check / Lint check (3.14)	22s
Code checks / Type check / Type check (3.12)	46s
Code checks / Type check / Type check (3.11)	47s
Code checks / Type check / Type check (3.10)	45s
Code checks / Type check / Type check (3.14)	45s
Code checks / Type check / Type check (3.13)	48s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	4m 36s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	4m 58s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 15s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 25s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	6m 1s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 34s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	3m 39s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	4m 50s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	6m 18s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	7m 22s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	4m 36s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	7m 30s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	6m 5s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	5m 50s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	6m 42s
	1h 30m 48s

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