Basic selectable todo functionality working

Can:
- move between todo items
- toggle checked/unchecked state

Cannot:
- persiste changes to file
- add items
- delete items

github/widget.go

@@ -96,6 +96,4 @@ func (widget *Widget) keyboardIntercept(event *tcell.EventKey) *tcell.EventKey {
 	default:
 		return event
 	}
-
-	return event
 }