mint signup visibility components

[ethanpalm]

Documentation changes

This PR adds visibility components giving better context on CLI commands for agents to the CLI and quickstart 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 audience targeting via Visibility; no runtime, auth, or product behavior changes.

Overview
Adds Visibility splits so humans still see the browser quickstart and copy-paste agent prompt, while agents get CLI-first setup instructions in Markdown exports.

On Quickstart, agent-only content introduces “Set up Mintlify for the user” (anchor #set-up-mintlify-for-the-user) with a 10-step workflow: Node/CLI install, mint status / mint login / mint signup, mint new, mint dev --no-open, mint validate / mint broken-links, git push, and verifying the .mintlify.site URL. Browser onboarding steps are wrapped in for="humans"; the deploy section tells agents to use that workflow instead of dashboard-only instructions.

CLI pages get short for="agents" callouts linking to the same quickstart section—About the CLI steers full-site setup through the CLI, and Install says not to stop after mint --version and covers session preservation plus signup/login.

Also fixes a missing newline at the end of quickstart.mdx.

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