Duplicate a portfolio to customize it

[pstacho]

Description

related to #189

Create a copy of the selected portfolio for a private use. The modification made on it will not impact the original portfolio.

Deliverables status

Phase 1

• [ ] Scenarios (Gherkin)
• [ ] Mockups
• [ ] Implementation strategy

Phase 2

• [ ] Acceptance tests (Capybara)
• [ ] Implementation

Phase 3

• [ ] Screencast