feat(views)!: move task position handling to its own crud entity

BREAKING CHANGE: the position of tasks now can't be updated anymore via the task update endpoint. Instead, there is a new endpoint which takes the project view into account as well.

pkg/modules/migration/trello/trello.go

@@ -253,9 +253,8 @@ func convertTrelloDataToVikunja(trelloData []*trello.Board, token string) (fullV
 
 				// The usual stuff: Title, description, position, bucket id
 				task := &models.Task{
-					Title:          card.Name,
-					KanbanPosition: card.Pos,
-					BucketID:       bucketID,
+					Title:    card.Name,
+					BucketID: bucketID,
 				}
 
 				task.Description, err = convertMarkdownToHTML(card.Desc)