refactor: remove sidemenu_item_icon_color property from the configura…
Created by: xkureck
…tion
- by this change no instanceConfig needs to be rewritten so this is not breaking change
- removing from theme: { sidemenu_item_icon_color} - in admin gui it was unused completely and in user profile + publications it didn't make any sense (who wants the color of the icon different than the color of the text right next to it)
- and by that it caused more problems - when developer wants to set color of the text, when the item is active, the icon color will remain the same - but we want to change the color of icon too