Add link to anchors on each title
Add some basic styling to set all the groups to not show at start
Add a frontend JS file with group model
Remove the link on headers
Add a controller

It creates groups, from the model,
then all the groups get their own heights, bind click on title,
and close themselves
Add transition on the height of groups' contents
Merge pull request #8 from Qt-dev/feature/add-foldable-menus

Feature/add foldable menus