docs: add DocItem Content theme component #388

Job	Run time
Type check / Type check (3.10)	17s
Type check / Type check (3.12)	19s
Type check / Type check (3.11)	17s
Lint check / Lint check (3.12)	10s
Docs check / Docs check	1m 4s
Type check / Type check (3.13)	17s
Lint check / Lint check (3.11)	9s
Lint check / Lint check (3.10)	11s
Unit tests / Unit tests (windows-latest, 3.12)	43s
Unit tests / Unit tests (ubuntu-latest, 3.11)	21s
Unit tests / Unit tests (windows-latest, 3.13)	1m 0s
Unit tests / Unit tests (ubuntu-latest, 3.13)	28s
Lint check / Lint check (3.13)	13s
Async dostrings check / Async docstrings check	18s
Unit tests / Unit tests (windows-latest, 3.10)	46s
Unit tests / Unit tests (ubuntu-latest, 3.12)	23s
Unit tests / Unit tests (ubuntu-latest, 3.10)	26s
Unit tests / Unit tests (windows-latest, 3.11)	38s
Integration tests / Approve integration tests for PRs from forks	3s
Integration tests / Integration tests	0s
Integration tests / Integration tests for PRs from forks	0s
	8m 3s

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