Add workflow docs

[ethanpalm]

Documentation changes

This PR renames the existing workflow page to "Use cases" and documents the new workflow feature.

Closes https://linear.app/mintlify/issue/DOC-272/docs-for-new-workflows
Closes https://linear.app/mintlify/issue/ENG-6471/update-our-documentation-on-workflows

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Low Risk
Docs-only changes (new pages and navigation reorder) with minimal risk beyond potential link/navigation mismatches.

Overview
Adds first-class documentation for the new Agent Workflows feature and reorganizes existing guidance.

Introduces a new agent/workflows.mdx page that explains workflow file structure, triggers (cron and push), context repos, and automerge, with several end-to-end example workflows (style audit, feature docs, API reference sync, translation lag, SEO audit). The previous “workflows” examples content is split into a new agent/use-cases.mdx, and navigation is updated (docs.json + agent/index.mdx) to link to both pages.

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