docs: Add guide "HttpCrawler with custom parser" #21

Job	Run time
PR title check	5s
Code checks / Actions lint check	27s
Doc checks / Doc checks / Docs check	1m 40s
Code checks / Type check / Type check (3.13)	46s
Code checks / Lint check / Lint check (3.12)	25s
Code checks / Lint check / Lint check (3.14)	24s
Code checks / Type check / Type check (3.10)	43s
Code checks / Type check / Type check (3.11)	48s
Code checks / Type check / Type check (3.12)	44s
Code checks / Lint check / Lint check (3.13)	28s
Code checks / Lint check / Lint check (3.11)	31s
Code checks / Lint check / Lint check (3.10)	26s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	7m 25s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	6m 48s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 4s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	4m 41s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 43s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 14s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	3m 52s
Code checks / Type check / Type check (3.14)	53s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	6m 36s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	9m 22s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	6m 24s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	7m 1s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	7m 21s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	8m 9s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	5m 41s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	5m 10s
	1h 40m 51s

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