Add API reference for onboarding, gamification, and notifications

[mintlify]

Summary

• Added API reference pages for the new onboarding, gamification, and notifications systems
• Onboarding: step-by-step progress tracking with auto-completion, skip, and manual step completion
• Gamification: badges, points, levels, login streaks, badge checks, and leaderboard
• Notifications: in-app notifications for badges, referrals, level-ups, deployments, and streaks
• Updated the API overview endpoint reference table with all new endpoints
• Added new pages to the docs.json navigation under API Reference

[vercel]

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Project	Deployment	Actions	Updated (UTC)
mintlify-docs	Ready	Preview, Comment	Apr 4, 2026 5:07am