[FEATURE] added links to flow of documents widget

__Tasks:__

- [ ] gather feedback

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | 
| BC Breaks     | -
| Doc           | -

__Requires:__
- https://github.com/sulu-cmf/SuluSalesCoreBundle/pull/10