docs: add DocItem Content theme component #630

Job	Run time
Lint check / Lint check (3.12)	13s
Lint check / Lint check (3.11)	8s
Type check / Type check (3.10)	25s
Lint check / Lint check (3.10)	8s
Docs check / Docs check	1m 3s
Lint check / Lint check (3.13)	9s
Unit tests / Unit tests (ubuntu-latest, 3.11)	22s
Unit tests / Unit tests (ubuntu-latest, 3.10)	27s
Unit tests / Unit tests (ubuntu-latest, 3.13)	22s
Unit tests / Unit tests (windows-latest, 3.12)	58s
Unit tests / Unit tests (windows-latest, 3.13)	45s
Type check / Type check (3.13)	27s
Unit tests / Unit tests (windows-latest, 3.11)	40s
Type check / Type check (3.12)	25s
Type check / Type check (3.11)	23s
Unit tests / Unit tests (ubuntu-latest, 3.12)	22s
Unit tests / Unit tests (windows-latest, 3.10)	43s
Integration tests / Approve integration tests for PRs from forks	1h 48m 21s
Integration tests / Integration tests	0s
Integration tests / Integration tests for PRs from forks	0s
	1h 56m 21s

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