Create a Tei-Publisher styleguide

Examples
http://primercss.io/
https://livingstyleguide.org/examples/default.html

Benefits

For users:
The project provides a user manual for the UI components and the general theming
For further development:
Creating a structured overview of all UI components (including their respective markup and layout), is additionally preparing a modularization in terms of Web components.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information