Remove custom types

[FasteryXD]

Is your feature request related to a problem? Please describe. I would love to be able to remove custom types in Gramps Web. I've accidentally created 10 of them right now, and it's annoying when I want to add a simple type because the custom ones are defined as "normal" once they've been created.

Describe the solution you'd like I could imagine a small X in the top right corner of the custom types. Or a trash can in the middle right of that kind.

Additional context Of course, only if it is feasible.

[DavidMStraub]

This is currently blocked as it would first have to be implemented in the backend.

[DavidMStraub]

(But the request makes sense, thanks!)