Improve feature configuration

[huang-julien]

Describe the feature

We can now configure each features. But would be nice to explore how to improve UX by making feature more configurable.

• Image performances
  • domain ignore list
    • Some images can come from outside domains which does not provide image transformation. Users should be able to ignore them.

Additional information

• Would you be willing to help implement this feature?
• Could this feature be implemented as a module?

Final checks

• Read the contribution guide.
• Check existing discussions and issues.