Create documentation on the different admin themes available
We now have a number of different admin themes available but this is rather hidden and many users are unaware that there is even an option to change theme. I think it would be good to make this more visible and suggest that we add a page to the Sysadmin guide that covers this.
I would suggest that it covers the following themes as a minimum:
There is some discussion about themes on this page but it doesn't mention the above other than Shoreditch and is focussed more on the technicalities of creating a theme rather than installing an existing theme.
More details about themes: https://lab.civicrm.org/dev/user-interface