docs: add automatic api reference

[dolfim-ibm]

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Generate the automatic API documentation for the main Docling components and pipeline options.

Adding more docstrings, specially in the document_converter, will enhance the result.

Checklist:

• [x] Documentation has been updated, if necessary.
• [ ] Examples have been added, if necessary.
• [ ] Tests have been added, if necessary.

[mergify[bot]]

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🟢 Enforce conventional commit

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Make sure that we follow https://www.conventionalcommits.org/en/v1.0.0/

• [X] title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?:

[dolfim-ibm]