eslint is not enough for css, so we need a css linter too.
This commit adds stylelint to the project, we configure it
with prettier and add a check during the build process.
Integrate cunningham design system into app desk.
It comes with some boilerplate code that will have to be
adapted to our needs when we will get the design.
Used https://github.com/openfun/joanie as boilerplate, ran a few
transformations with ChapGPT and adapted models and endpoints to
fit to my current vision of the project.
