The dist directory contains the generated previews.
If you want to modify them, you need to rebuild them with the gulp tasks.
First you need nodejs
Install all devDependencies present in package.json
npm install
Then launch
npm run dev
to have the development environment (watcher, livereload, ...)
To build the source then delete dist and launch
npm run build
By default, the application is in a theme corresponding to your OS preferences.
In order to preview the different themes of the application, you have to write in the console of the browser :
Yadoms.lightOn() // to get the light mode
or
Yadoms.lightOff() // to get the dark mode