Improve (simplify ?) documentation
Documentation is quite large, but maybe boring to read. Make it more direct.
Simplify home page => only a very-very short introduction, links and contents.
Maybe pages dedicated to use cases are welcome: how to create a layout for a specific form? how to customize the layout of a particular field? how to render fieldsets or part of forms? how to inherit from another layout? * how to create a generic layout?