Color support for feed categories.

[33Fraise33]

• [X] I have read this document: https://miniflux.app/opinionated.html#feature-request

Hello,

I just installed miniflux and I really like the initial setup and usage of the tool. One of my first reactions was looking for a way to override the default color for categories as requested in https://github.com/miniflux/v2/issues/299.

Is it possible to reconsider this, add a drop down under category creation and edit where you can select from a predefined set of +- 10 colors?

Thanks!