docs(agent): add notification subscription settings to suggestions

[ethanpalm]

Add documentation for email and Slack notification subscriptions for agent suggestions. Users can now configure notifications in the agent settings panel to receive alerts when new suggestions are created.

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Documentation changes

Brief description of what's being updated

Closes

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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

Documents email/Slack notifications and simplifies agent suggestions configuration and monitoring instructions.

• Docs updates (ai/suggestions.mdx):
  • Configure suggestions: Consolidates setup into clear steps to access agent settings; clarifies that settings show all monitored orgs/repos.
  • Monitor repositories: Clarifies monitoring behavior (default branch, GitHub check, backfill) and notes immediate stop when disabled.
  • Notifications: Adds section for email/Slack alerts; includes tip to safelist notifications@mintlify.com.
  • Review/Dismiss: Minor copy fix in dismiss instructions (“next to any”).

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