Show folder arborescence in the left hand sidebar

The Left Hand sidebar currently only says "My Storages".

It should show set of storages by default (clickable like the breadcrumb navigation links):

Add a Carret icon for each to show/hide the folder hierarchy.

For example:


My Storages
```
> xxx
v yyy
   > yyy1
   > yyy2
   file1.txt
> zzz
```