I did some modifications on my fork to add support in the sidebar.
I’m not sure this is entirely okay this way, so posting here for now. I would gladly create a PR on the official repo if valid.
To test, install a new component from https://github.com/Arkshine/discourse-category-icons and provide the branch feature/sidebar-support (click on the Advanced button)
Note: you will have to fill in your settings again. Don’t forget to disable the official one.
