Please report issues on YunoHost bugtracker.
You can refer to the page on writing documentation.
We use scss to manage the css. If you want to change it, you must rebuild it.
First install npm, then in the root folder of this repo, install sass: npm install sass
Finally you can rebuild the css with (You can replace expanded by compressed if you want):
./node_modules/sass/sass.js themes/yunohost-docs/scss:themes/yunohost-docs/css --style expandedSource: https://sass-lang.com/guide