Make left hand sidebar items collapsible and allow for sub-links

🚀 Feature Proposal

The left hand sidebar should make the items collapsible and allow for sub links.

Sidebar should look something like:

- Dashboard
- Patient
  - New Patient
  - Patient List  
- Scheduling
   - New Appointment
   - Appointment Schedule

When accessing any route /patient/**, the Patients item should be highlighted. When accessing any route /appointments/** the Scheduling item should be highlighted.

Sub items should also be properly marked active. (E.g. when New Patient screen is shown, Patient Item should be highlighted and New Patient item should be highlighted.

Clicking on any other section should collapse the previously selected section and expand the newly selected one.

Example

It should operate very similarly to http://demo.hospitalrun.io/

Technical Notes

Should remove dropdown links from Navbar.

[fox1t]

Here we have to hear something from @StefanoMiC too!

[jackcmeyer]

@sotous just the default white for any selected children. I’m not sure that a color separation between the selected parent and the selected child is necessary.