docs: Add guide "HttpCrawler with custom parser" #54

Job	Run time
PR title check	5s
Code checks / Spell check	5s
Code checks / Actions lint check	28s
Doc checks / Doc checks / Docs check	1m 39s
Code checks / Type check / Type check (3.14)	47s
Code checks / Lint check / Lint check (3.14)	24s
Code checks / Lint check / Lint check (3.11)	24s
Code checks / Lint check / Lint check (3.13)	26s
Code checks / Type check / Type check (3.10)	45s
Code checks / Type check / Type check (3.11)	40s
Code checks / Lint check / Lint check (3.10)	23s
Code checks / Type check / Type check (3.12)	46s
Code checks / Lint check / Lint check (3.12)	27s
Code checks / Type check / Type check (3.13)	42s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	5m 27s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	7m 11s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	4m 59s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	3m 39s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	7m 37s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	7m 12s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	5m 44s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	6m 58s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	7m 46s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	5m 54s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	6m 21s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 31s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 37s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 13s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	5m 37s
	1h 36m 47s

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