docs: Add documentation for Google Drive, Microsoft SharePoint and OAuth integrations

[bogdankostic]

Related Issues

• related to https://github.com/deepset-ai/haystack-private/issues/346

Proposed Changes:

This PR adds documentation pages for the OAuth, Microsoft Sharepoint, and Google Drive integrations.

How did you test it?

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct.
• I have updated the related issue with new insights and changes.
• I have added unit tests and updated the docstrings.
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
• I have documented my code.
• I have added a release note file, following the contributors guidelines.
• I have run pre-commit hooks and fixed any issue.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
haystack-docs	Ignored	Preview	Jun 26, 2026 7:48am

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[sjrl]

Looks good!

Only slightly odd thing is in the preview I don't see your docs appearing in the Haystack 2.30 versioned page and I only seem them in the 2.31 unstable.

But otherwise the docs pages themselves look good