Theming

Adapting existing HTML admin dashboard template

For themes, you can adapt all dashboard HTML templates into a theme for ShadowsDash. The theme must be using bootstrap! Shadow's dash is made using the dashboard template from Creative Tim called Argon. Unless you want to recode entirely the frontend, I recommend you to take a dashboard that has similar class names for its components

Recoding the whole frontend directly from the source

Otherwise, you can edit the frontend directly from the source code, using all the .php files to your need.

There is no need to do the steps in the "Installing add-ons" documentation pages. Just warn the users before they download the add-on.