Employees can delete their articles

### Why

**As an Employee**
**I want to be able to delete my articles**
**So that I can remove my article on the platform**

### Acceptance Criteria

```gherkin
Scenario: 
Given that an employee make a delete request on this endpoint (i.e api/v1/articles/{articleId})
When the article to be removed exist on the platform
Then such article will be removed from the platform
```

