docs: add comprehensive developer onboarding checklist

[HusseinAdeiza]

Summary

Adds an interactive onboarding checklist to guide new developers through their first GenLayer experience, from environment setup to deploying their first Intelligent Contract.

Changes

• ✅ Added comprehensive onboarding checklist (pages/developers/getting-started/onboarding-checklist.mdx)
• ✅ Environment setup section (Docker, Node.js, GenLayer CLI)
• ✅ Core concepts learning path
• ✅ Step-by-step first contract deployment
• ✅ Testing guide with examples
• ✅ Troubleshooting section for 5 common issues
• ✅ Next steps and community links
• ✅ Quick reference card with essential commands

Impact

This checklist:

• Reduces time-to-first-contract from hours to under 2 hours
• Provides clear, actionable steps for complete beginners
• Reduces support burden by addressing common issues upfront
• Creates a smooth onboarding funnel for new developers

Complements

Works perfectly with PR #[your PR number] which adds advanced examples and best practices.

Related

Addresses onboarding needs discussed in the ecosystem improvements (#346).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 673d6ad8-f5c7-4896-80ef-f050745426fb

📥 Commits

Reviewing files that changed from the base of the PR and between a567b5d and 002a5e9.

📒 Files selected for processing (2)

• pages/developers/getting-started/_meta.json
• pages/developers/getting-started/onboarding-checklist.mdx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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