Inspired by https://github.com/alexbowers/nova-categorise-resources. Makes Nova core theme navigation collapsible using core functionality of resources $groups. If you have lots of groups you might end up with a long list of resources. You can group them but again it will be a long list. With this package groups are displayed as collapsed menu items. All you need to do is keep using the $groups and install this package via:

composer require tanmuhittin/nova-collapsible-groups

• https://github.com/alexbowers
• https://github.com/tanmuhittin

• Add +/- (credit: https://github.com/Journeytojah)
• Fix styling indentation to match other indentation
• Set top group to be expanded on start
• Upgraded some node packages