docs: set production url to resolve og image correctly

[MuhammadM1998]

🔗 Linked issue

N/A

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation or readme)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

OG images were generated correctly but wrongly prefixed with the default localehost:3000. Setting the production URL as instructed in ogImage docs solves the issue.

Before

After

📝 Checklist

• [ ] I have linked an issue or discussion.
• [ ] I have updated the documentation accordingly.

[BobbieGoede]

Thanks!