[8] As a user I want to remove feeds I am no longer interested in to hold my feed list clear

Implement the possibility to remove a feed from the app.

ToDo

Custom:

• Add "Remove Feed" button at the bottom of the edit feed view
• Remove Feed provider if every of its children feeds has been removed
• call cleanup after removing a feed to make sure it doest just get reloaded
• Delete every article that is associated with the feed
• Add warning when deleting a feed telling the user how many bookmarked articles (related to the feed) will be deleted

Defaults:

• Report Changes in UML
• Report Changes in Wireframes

Acceptance criteria

Custom:

• Removing feeds works
• Feed providers get deleted when the last child is removed
• All json files get deleted on deletion

Defaults:

• Naming Convention for Classes, Functions and Variables are met
• Comments are sufficient

Effort:

8