Editor UI updates and ask agent

[ethanpalm]

Documentation changes

closes https://linear.app/mintlify/issue/DOC-332/update-ui-screenshots-in-editor-docs

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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
Documentation-only changes with no application code; main risk is broken internal links or stale references in locale files not updated in this diff.

Overview
This PR restructures the web editor documentation to match the updated UI and surfaces the in-editor Ask agent feature as its own page (editor/agent.mdx), covering chat, @ mentions, attachments, changed-files review, code mode, and session history.

Navigation (docs.json) drops the Editor group’s “New” tag and reorders pages: Git essentials earlier, Ask agent added, keyboard shortcuts moved to the end. Standalone editor/collaborate.mdx and editor/share-a-preview.mdx are removed; preview sharing and related flows live under Branching and publishing, with real-time collaboration called out there and in branching content.

Content updates align terminology with the product (source mode vs Markdown mode, top bar, draft vs publish). Editor overview adds a tutorial card and layout screenshots; Configurations is reorganized to mirror docs.json sections (General, Branding, Navbar, SEO, Analytics, etc.). The Git operations table moves from branching to Git essentials; keyboard shortcuts gain editor-wide entries (agent toggle, diff view, sidebar). Tutorial steps are expanded for PR approval and merge-and-publish. Changelog fixes the shareable preview link anchor to branching-and-publishing.

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