Adding an icon to the icon library is a painful process

[rjimenezda]

Right now, if we want to add new icons, there's a relatively convoluted process, which involves using a third-party service: https://github.com/CartoDB/airship/blob/master/packages/icons/DEVELOPERS.md

We should investigate if we can do this better. Ideally we only have a folder with our icons, and their name will be the assigned classname. Through the build process the fonts should be generated.