docs: add troubleshooting section to builder setup guide

[ygd58]

Summary

Adds a Troubleshooting section to the Builder Setup documentation to reduce onboarding friction for first-time contributors.

Changes

• Added common setup errors with solutions:
  • ModuleNotFoundError: No module named genlayer
  • Docker daemon not running
  • Port 4000 already in use (with Windows findstr fix)
  • gltest: command not found
• Added Getting Help section with Discord and GitHub Issues links

Related Issue

Closes #400

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: d487b960-98c3-4c67-8662-f8194ac5e014

📥 Commits

Reviewing files that changed from the base of the PR and between 864cd05 and 2cd84cf.

📒 Files selected for processing (1)

• pages/developers/intelligent-contracts/tooling-setup.mdx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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