Add property(s) to set the color/font of each sidebar item.

### Feature Proposal

We have different sidebars for logged in versus logged out users.  We would like to be able to highlight sidebar items (with a different color or font) that have been added when a user logs in.

I don't see anything like this in the docs, but if there is already a way to do this, please let me know.

### Related Context or Links

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