docs: use of the `customize` option

[ezequidias]

🔗 Linked issue

bugfix: [#199] Fixed stroke width customization issue

❓ Type of change

• [x] 📖 Documentation (updates to the documentation or readme)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

• Ensure stroke width is properly applied to all icons