Fixed Deleting from Exercises

[tfnribeiro]

Before Deleting the bookmark was associated with the Word component (the trash icon, but now since we have moved the delete action to the edit form, it doesn't make sense to have this action in the word component.

• Moved the delete action to the EditButton, as now the logic is always handled here.
• NextNavigation has a state for the case of the bookmark being deleted to simply move to the next exercise.
• Deleted Starred State in Word, and TrashIcon commented out code.

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[mircealungu]

before merging, made a few changes in https://github.com/zeeguu/web/pull/420/commits/d81dc6094e07ecce5de192e81801ab194cacfac6:

• renamed EditButton to EditBookmarkButton
• removed the setDeleted param from the EditBookmarkButton. It's not normal for the button to tamper directly with the parent's state. Instead in case the bookmak is deleted, the only thing that is being done is that the notifyDeleted(bookmark) is being called; it's up to the parent to setDeleted if that makes sense in their context.
• also, EditBookmarkButton#deleteBookmark is now testing that the deletion was successful; if not it shows a failure message;