docs: Add guide "HttpCrawler with custom parser" #19

Job	Run time
PR title check	3s
Doc checks / Doc checks / Docs check	1m 42s
Code checks / Actions lint check	32s
Code checks / Lint check / Lint check (3.12)	27s
Code checks / Type check / Type check (3.12)	52s
Code checks / Type check / Type check (3.10)	48s
Code checks / Lint check / Lint check (3.10)	31s
Code checks / Lint check / Lint check (3.11)	24s
Code checks / Type check / Type check (3.14)	47s
Code checks / Lint check / Lint check (3.14)	27s
Code checks / Lint check / Lint check (3.13)	24s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	4m 19s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 47s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 33s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	6m 35s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	8m 2s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	6m 46s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	5m 13s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 28s
Code checks / Type check / Type check (3.13)	42s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	6m 3s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	5m 26s
Code checks / Type check / Type check (3.11)	46s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	10m 5s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	5m 14s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	5m 42s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	6m 29s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	7m 11s
	1h 40m 18s

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