Add :
 - Navbar items
 - Breadcrumb with buttons in workspace view
 - Property button displayed only on hover

Remove top white bar for all views except workspace

The new features don't work, it display a modal instead.
Navbar update
Better UI for property (add/delete). Deletion is done without confirmation but give a restore button
Fix error display in repository and workspace view
Fix property search input responsiveness
Fix index and repository view responsiveness
Merge pull request #11 from marmelab/ui_update

[RFR] UI Improvement for next features