List items are now inline-block meaning other items/images can be placed beside it and the dragging won't affect the whole width of the page
Add (+) button or remove it whenever sublist has content
Cleanup resave() function
Fixed bugs where reloaded pages did not have working collapse buttons:
- need to reattach button listeners

Fixed bug where moving a sublist item a little (but not moving it to a new destination) will cause duplicated collapse buttons
As well moving more sublist items inside the sublist
- do a check on the jQuery selector for the <a> element to see whether it has a length of 0 or not before adding a collapse button