ci: enable automatic deployment to Render

[victorbruce]

🎯 What This Does

Enables automatic deployment to Render on main branch pushes.

✅ Changes

• Uncommented push trigger in deploy-render.yml
• Updated Render URLs with actual service URL
• Enabled health check verification

🔐 Prerequisites

• Render service deployed and running
• RENDER_DEPLOY_HOOK_URL added to GitHub Secrets
• Live URL: https://angular-starter-project.onrender.com

🚀 After Merge

First automatic deployment will trigger when this PR is merged to main.

✅ Testing

• Render deploy hook URL obtained
• GitHub secret configured
• URLs updated in workflow
• Ready for auto-deployment